RPC Block Subscription (backport #21787) (#21992)

* RPC Block Subscription (#21787)

* add stuff

* compiling

* add notify block

* wip

* feat: add blockSubscribe pubsub method

* address PR comments

Co-authored-by: Lucas B <buffalu@jito.network>
Co-authored-by: Zano <segfaultdoctor@protonmail.com>
(cherry picked from commit 76098dd42a)

# Conflicts:
#	Cargo.lock
#	client-test/Cargo.toml
#	rpc/src/rpc_subscriptions.rs

* Fix conflicts

Co-authored-by: segfaultdoctor <seg@jito.network>
Co-authored-by: Tyera Eulberg <tyera@solana.com>

client/src/rpc_config.rs

@@ -182,6 +182,23 @@ pub struct RpcSignatureSubscribeConfig {
     pub enable_received_notification: Option<bool>,
 }
 
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum RpcBlockSubscribeFilter {
+    All,
+    MentionsAccountOrProgram(String),
+}
+
+#[derive(Debug, Clone, Default, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RpcBlockSubscribeConfig {
+    #[serde(flatten)]
+    pub commitment: Option<CommitmentConfig>,
+    pub encoding: Option<UiTransactionEncoding>,
+    pub transaction_details: Option<TransactionDetails>,
+    pub show_rewards: Option<bool>,
+}
+
 #[derive(Debug, Clone, Default, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct RpcSignaturesForAddressConfig {