Rpc: enable getConfirmedBlock and getConfirmedTransaction to return confirmed (not yet finalized) data (bp #16142) (#16160)

* Rpc: enable getConfirmedBlock and getConfirmedTransaction to return confirmed (not yet finalized) data (#16142)

* Add Blockstore block and tx apis that allow unrooted responses

* Add TransactionStatusMessage, and send on bank freeze; also refactor TransactionStatusSender

* Track highest slot with tx-status writes complete

* Rename and unpub fn

* Add commitment to GetConfirmed input configs

* Support confirmed blocks in getConfirmedBlock

* Support confirmed txs in getConfirmedTransaction

* Update sigs-for-addr2 comment

* Enable confirmed block in cli

* Enable confirmed transaction in cli

* Review comments

* Rename blockstore method

(cherry picked from commit 433f1ead1c)

# Conflicts:
#	core/src/replay_stage.rs

* Fix conflict

Co-authored-by: Tyera Eulberg <teulberg@gmail.com>
Co-authored-by: Tyera Eulberg <tyera@solana.com>

core/src/rpc_service.rs

@@ -30,7 +30,7 @@ use std::{
     collections::HashSet,
     net::SocketAddr,
     path::{Path, PathBuf},
-    sync::atomic::{AtomicBool, Ordering},
+    sync::atomic::{AtomicBool, AtomicU64, Ordering},
     sync::{mpsc::channel, Arc, Mutex, RwLock},
     thread::{self, Builder, JoinHandle},
 };
@@ -276,6 +276,7 @@ impl JsonRpcService {
         send_transaction_leader_forward_count: u64,
         max_slots: Arc<MaxSlots>,
         leader_schedule_cache: Arc<LeaderScheduleCache>,
+        current_transaction_status_slot: Arc<AtomicU64>,
     ) -> Self {
         info!("rpc bound to {:?}", rpc_addr);
         info!("rpc configuration: {:?}", config);
@@ -356,6 +357,7 @@ impl JsonRpcService {
             largest_accounts_cache,
             max_slots,
             leader_schedule_cache,
+            current_transaction_status_slot,
         );
 
         let leader_info =
@@ -521,6 +523,7 @@ mod tests {
             1,
             Arc::new(MaxSlots::default()),
             Arc::new(LeaderScheduleCache::default()),
+            Arc::new(AtomicU64::default()),
         );
         let thread = rpc_service.thread_hdl.thread();
         assert_eq!(thread.name().unwrap(), "solana-jsonrpc");