Add base64+zstd encoding for RPC account data

docs/src/developing/clients/jsonrpc-api.md

@@ -205,16 +205,12 @@ Returns all information associated with the account of provided Pubkey
 - `<object>` - (optional) Configuration object containing the following optional
 fields:
   - (optional) [Commitment](jsonrpc-api.md#configuring-state-commitment)
-  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*),
-"base64", or "jsonParsed". "base58" is limited to Account data of less than 128
-bytes. "base64" will return base64 encoded data for Account data of any size.
-"jsonParsed" encoding attempts to use program-specific state parsers to return
-more human-readable and explicit account state data. If "jsonParsed" is requested
-but a parser cannot be found, the field falls back to "base64" encoding, detectable
-when the `data` field is type `<string>`.
-  - (optional) `dataSlice: <object>` - limit the returned account data using the
-provided `offset: <usize>` and `length: <usize>` fields; only available for
-"base58" or "base64" encoding.
+  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64", "base64+zstd", or "jsonParsed".
+    "base58" is limited to Account data of less than 128 bytes.
+    "base64" will return base64 encoded data for Account data of any size.
+    "base64+zstd" compresses the Account data using [Zstandard](https://facebook.github.io/zstd/) and base64-encodes the result.
+    "jsonParsed" encoding attempts to use program-specific state parsers to return more human-readable and explicit account state data. If "jsonParsed" is requested but a parser cannot be found, the field falls back to "base64" encoding, detectable when the `data` field is type `<string>`.
+  - (optional) `dataSlice: <object>` - limit the returned account data using the provided `offset: <usize>` and `length: <usize>` fields; only available for "base58", "base64" or "base64+zstd" encodings.
 
 #### Results:
 
@@ -469,7 +465,7 @@ Returns identity and transaction information about a confirmed block in the ledg
 #### Parameters:
 
 - `<u64>` - slot, as u64 integer
-- `<string>` - encoding for each returned Transaction, either "json", "jsonParsed", "base58" (*slow*), or "base64". If parameter not provided, the default encoding is JSON.
+- `<string>` - encoding for each returned Transaction, either "json", "jsonParsed", "base58" (*slow*), "base64". If parameter not provided, the default encoding is "json".
   "jsonParsed" encoding attempts to use program-specific instruction parsers to return more human-readable and explicit data in the `transaction.message.instructions` list. If "jsonParsed" is requested but a parser cannot be found, the instruction falls back to regular JSON encoding (`accounts`, `data`, and `programIdIndex` fields).
 
 #### Results:
@@ -1565,9 +1561,13 @@ Returns the account information for a list of Pubkeys
 - `<array>` - An array of Pubkeys to query, as base-58 encoded strings
 - `<object>` - (optional) Configuration object containing the following optional fields:
   - (optional) [Commitment](jsonrpc-api.md#configuring-state-commitment)
-  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64", or "jsonParsed". "base58" is limited to Account data of less than 128 bytes. "base64" will return base64 encoded data for Account data of any size.
-    "jsonParsed" encoding attempts to use program-specific state parsers to return more human-readable and explicit account state data. If "jsonParsed" is requested but a parser cannot be found, the field falls back to base64 encoding, detectable when the `data` field is type `<string>`.
-  - (optional) `dataSlice: <object>` - limit the returned account data using the provided `offset: <usize>` and `length: <usize>` fields; only available for "base58" or "base64" encoding.
+  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64", "base64+zstd", or "jsonParsed".
+    "base58" is limited to Account data of less than 128 bytes.
+    "base64" will return base64 encoded data for Account data of any size.
+    "base64+zstd" compresses the Account data using [Zstandard](https://facebook.github.io/zstd/) and base64-encodes the result.
+    "jsonParsed" encoding attempts to use program-specific state parsers to return more human-readable and explicit account state data. If "jsonParsed" is requested but a parser cannot be found, the field falls back to "base64" encoding, detectable when the `data` field is type `<string>`.
+  - (optional) `dataSlice: <object>` - limit the returned account data using the provided `offset: <usize>` and `length: <usize>` fields; only available for "base58", "base64" or "base64+zstd" encodings.
+
 
 #### Results:
 
@@ -1708,9 +1708,12 @@ Returns all accounts owned by the provided program Pubkey
 - `<string>` - Pubkey of program, as base-58 encoded string
 - `<object>` - (optional) Configuration object containing the following optional fields:
   - (optional) [Commitment](jsonrpc-api.md#configuring-state-commitment)
-  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64" or "jsonParsed".
-    "jsonParsed" encoding attempts to use program-specific state parsers to return more human-readable and explicit account state data. If "jsonParsed" is requested but a parser cannot be found, the field falls back to base64 encoding, detectable when the `data` field is type `<string>`. If "jsonParsed" is requested for the SPL Token program, when a valid mint cannot be found for a particular account, that account will be filtered out from results.
-  - (optional) `dataSlice: <object>` - limit the returned account data using the provided `offset: <usize>` and `length: <usize>` fields; only available for "base58" or "base64" encoding.
+  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64", "base64+zstd", or "jsonParsed".
+    "base58" is limited to Account data of less than 128 bytes.
+    "base64" will return base64 encoded data for Account data of any size.
+    "base64+zstd" compresses the Account data using [Zstandard](https://facebook.github.io/zstd/) and base64-encodes the result.
+    "jsonParsed" encoding attempts to use program-specific state parsers to return more human-readable and explicit account state data. If "jsonParsed" is requested but a parser cannot be found, the field falls back to "base64" encoding, detectable when the `data` field is type `<string>`.
+  - (optional) `dataSlice: <object>` - limit the returned account data using the provided `offset: <usize>` and `length: <usize>` fields; only available for "base58", "base64" or "base64+zstd" encodings.
   - (optional) `filters: <array>` - filter results using various [filter objects](jsonrpc-api.md#filters); account must meet all filter criteria to be included in results
 
 ##### Filters:
@@ -2252,9 +2255,9 @@ Returns all SPL Token accounts by approved Delegate. **UNSTABLE**
   * `programId: <string>` - Pubkey of the Token program ID that owns the accounts, as base-58 encoded string
 - `<object>` - (optional) Configuration object containing the following optional fields:
   - (optional) [Commitment](jsonrpc-api.md#configuring-state-commitment)
-  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64" or "jsonParsed".
+  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64", "base64+zstd" or "jsonParsed".
     "jsonParsed" encoding attempts to use program-specific state parsers to return more human-readable and explicit account state data. If "jsonParsed" is requested but a valid mint cannot be found for a particular account, that account will be filtered out from results.
-  - (optional) `dataSlice: <object>` - limit the returned account data using the provided `offset: <usize>` and `length: <usize>` fields; only available for "base58" or "base64" encoding.
+  - (optional) `dataSlice: <object>` - limit the returned account data using the provided `offset: <usize>` and `length: <usize>` fields; only available for "base58", "base64" or "base64+zstd" encodings.
 
 #### Results:
 
@@ -2341,9 +2344,9 @@ Returns all SPL Token accounts by token owner. **UNSTABLE**
   * `programId: <string>` - Pubkey of the Token program ID that owns the accounts, as base-58 encoded string
 - `<object>` - (optional) Configuration object containing the following optional fields:
   - (optional) [Commitment](jsonrpc-api.md#configuring-state-commitment)
-  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64" or "jsonParsed".
+  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64", "base64+zstd" or "jsonParsed".
     "jsonParsed" encoding attempts to use program-specific state parsers to return more human-readable and explicit account state data. If "jsonParsed" is requested but a valid mint cannot be found for a particular account, that account will be filtered out from results.
-  - (optional) `dataSlice: <object>` - limit the returned account data using the provided `offset: <usize>` and `length: <usize>` fields; only available for "base58" or "base64" encoding.
+  - (optional) `dataSlice: <object>` - limit the returned account data using the provided `offset: <usize>` and `length: <usize>` fields; only available for "base58", "base64" or "base64+zstd" encodings.
 
 #### Results:
 
@@ -2854,7 +2857,7 @@ Subscribe to an account to receive notifications when the lamports or data for a
 - `<string>` - account Pubkey, as base-58 encoded string
 - `<object>` - (optional) Configuration object containing the following optional fields:
   - `<object>` - (optional) [Commitment](jsonrpc-api.md#configuring-state-commitment)
-  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64" or "jsonParsed".
+  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64", "base64+zstd" or "jsonParsed".
     "jsonParsed" encoding attempts to use program-specific state parsers to return more human-readable and explicit account state data. If "jsonParsed" is requested but a parser cannot be found, the field falls back to binary encoding, detectable when the `data` field is type `<string>`.
 
 #### Results:
@@ -2989,7 +2992,7 @@ Subscribe to a program to receive notifications when the lamports or data for a
 - `<string>` - program_id Pubkey, as base-58 encoded string
 - `<object>` - (optional) Configuration object containing the following optional fields:
   - (optional) [Commitment](jsonrpc-api.md#configuring-state-commitment)
-  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64" or "jsonParsed".
+  - `encoding: <string>` - encoding for Account data, either "base58" (*slow*), "base64", "base64+zstd" or "jsonParsed".
     "jsonParsed" encoding attempts to use program-specific state parsers to return more human-readable and explicit account state data. If "jsonParsed" is requested but a parser cannot be found, the field falls back to base64 encoding, detectable when the `data` field is type `<string>`.
   - (optional) `filters: <array>` - filter results using various [filter objects](jsonrpc-api.md#filters); account must meet all filter criteria to be included in results