Rpc: add filter to getProgramAccounts (#10888)

* Add RpcFilterType, and implement CompareBytes for getProgramAccounts

* Accept bytes in bs58

* Rename to memcmp

* Add Memcmp optional encoding field

* Add dataSize filter

* Update docs

* Clippy

* Simplify tests that don't need to test account contents; add multiple-filter tests

client/src/rpc_config.rs

@@ -1,3 +1,4 @@
+use crate::rpc_filter::RpcFilterType;
 use solana_account_decoder::UiAccountEncoding;
 use solana_sdk::{clock::Epoch, commitment_config::CommitmentConfig};
 
@@ -49,3 +50,11 @@ pub struct RpcAccountInfoConfig {
     #[serde(flatten)]
     pub commitment: Option<CommitmentConfig>,
 }
+
+#[derive(Debug, Clone, Default, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RpcProgramAccountsConfig {
+    pub filters: Option<Vec<RpcFilterType>>,
+    #[serde(flatten)]
+    pub account_config: RpcAccountInfoConfig,
+}