Add missing websocket methods to rust RPC PubSub client (#21065)

- Added accountSubscribe,  programSubscribe, slotSubscribe and rootSubscribe to rust RpcClient
 - Removed duplication on cleanup threads
 - Moved RPCVote from rpc/ to client/rpc_response

rpc/src/rpc_pubsub.rs

@@ -8,7 +8,6 @@ use {
             ProgramSubscriptionParams, SignatureSubscriptionParams, SubscriptionControl,
             SubscriptionId, SubscriptionParams, SubscriptionToken,
         },
-        rpc_subscriptions::RpcVote,
     },
     dashmap::DashMap,
     jsonrpc_core::{Error, ErrorCode, Result},
@@ -21,7 +20,7 @@ use {
             RpcTransactionLogsConfig, RpcTransactionLogsFilter,
         },
         rpc_response::{
-            Response as RpcResponse, RpcKeyedAccount, RpcLogsResponse, RpcSignatureResult,
+            Response as RpcResponse, RpcKeyedAccount, RpcLogsResponse, RpcSignatureResult, RpcVote,
             SlotInfo, SlotUpdate,
         },
     },

rpc/src/rpc_subscriptions.rs

@@ -18,7 +18,7 @@ use {
         rpc_filter::RpcFilterType,
         rpc_response::{
             ProcessedSignatureResult, ReceivedSignatureResult, Response, RpcKeyedAccount,
-            RpcLogsResponse, RpcResponseContext, RpcSignatureResult, SlotInfo, SlotUpdate,
+            RpcLogsResponse, RpcResponseContext, RpcSignatureResult, RpcVote, SlotInfo, SlotUpdate,
         },
     },
     solana_measure::measure::Measure,
@@ -29,7 +29,7 @@ use {
     },
     solana_sdk::{
         account::{AccountSharedData, ReadableAccount},
-        clock::{Slot, UnixTimestamp},
+        clock::Slot,
         pubkey::Pubkey,
         signature::Signature,
         timing::timestamp,
@@ -69,15 +69,6 @@ fn get_transaction_logs(
     }
     logs
 }
-
-// A more human-friendly version of Vote, with the bank state signature base58 encoded.
-#[derive(Serialize, Deserialize, Debug)]
-pub struct RpcVote {
-    pub slots: Vec<Slot>,
-    pub hash: String,
-    pub timestamp: Option<UnixTimestamp>,
-}
-
 pub enum NotificationEntry {
     Slot(SlotInfo),
     SlotUpdate(SlotUpdate),