Add account-decoder utilities (#10846)

* Fix comment and make less pub

* Add account-decoder crate and use to decode vote and system (nonce) accounts

* Update docs

* Rename RpcAccount struct

* s/Rpc/Display

* Call it jsonParsed and update docs

* Revert "s/Rpc/Display"

This reverts commit 6e7149f503.

* s/Rpc/Ui

* Add tests

* Ui more things

* Comments

core/src/rpc_subscriptions.rs

@@ -7,8 +7,9 @@ use jsonrpc_pubsub::{
     SubscriptionId,
 };
 use serde::Serialize;
+use solana_account_decoder::{UiAccount, UiAccountEncoding};
 use solana_client::rpc_response::{
-    Response, RpcAccount, RpcKeyedAccount, RpcResponseContext, RpcSignatureResult,
+    Response, RpcKeyedAccount, RpcResponseContext, RpcSignatureResult,
 };
 use solana_runtime::{bank::Bank, bank_forks::BankForks, commitment::BlockCommitmentCache};
 use solana_sdk::{
@@ -90,7 +91,7 @@ struct SubscriptionData<S> {
     last_notified_slot: RwLock<Slot>,
 }
 type RpcAccountSubscriptions =
-    RwLock<HashMap<Pubkey, HashMap<SubscriptionId, SubscriptionData<Response<RpcAccount>>>>>;
+    RwLock<HashMap<Pubkey, HashMap<SubscriptionId, SubscriptionData<Response<UiAccount>>>>>;
 type RpcProgramSubscriptions =
     RwLock<HashMap<Pubkey, HashMap<SubscriptionId, SubscriptionData<Response<RpcKeyedAccount>>>>>;
 type RpcSignatureSubscriptions = RwLock<
@@ -225,12 +226,18 @@ impl RpcNotifier {
 fn filter_account_result(
     result: Option<(Account, Slot)>,
     last_notified_slot: Slot,
-) -> (Box<dyn Iterator<Item = RpcAccount>>, Slot) {
+) -> (Box<dyn Iterator<Item = UiAccount>>, Slot) {
     if let Some((account, fork)) = result {
         // If fork < last_notified_slot this means that we last notified for a fork
         // and should notify that the account state has been reverted.
         if fork != last_notified_slot {
-            return (Box::new(iter::once(RpcAccount::encode(account))), fork);
+            return (
+                Box::new(iter::once(UiAccount::encode(
+                    account,
+                    UiAccountEncoding::Binary,
+                ))),
+                fork,
+            );
         }
     }
     (Box::new(iter::empty()), last_notified_slot)
@@ -260,7 +267,7 @@ fn filter_program_results(
                 .into_iter()
                 .map(|(pubkey, account)| RpcKeyedAccount {
                     pubkey: pubkey.to_string(),
-                    account: RpcAccount::encode(account),
+                    account: UiAccount::encode(account, UiAccountEncoding::Binary),
                 }),
         ),
         last_notified_slot,
@@ -449,7 +456,7 @@ impl RpcSubscriptions {
         pubkey: Pubkey,
         commitment: Option<CommitmentConfig>,
         sub_id: SubscriptionId,
-        subscriber: Subscriber<Response<RpcAccount>>,
+        subscriber: Subscriber<Response<UiAccount>>,
     ) {
         let commitment_level = commitment
             .unwrap_or_else(CommitmentConfig::single)