Move transaction sanitization earlier in the pipeline (#18655)

* Move transaction sanitization earlier in the pipeline

* Renamed HashedTransaction to SanitizedTransaction

* Implement deref for sanitized transaction

* bring back process_transactions test method

* Use sanitized transactions for cost model calculation

banks-server/src/banks_server.rs

@@ -70,7 +70,7 @@ impl BanksServer {
                 .map(|info| deserialize(&info.wire_transaction).unwrap())
                 .collect();
             let bank = bank_forks.read().unwrap().working_bank();
-            let _ = bank.process_transactions(&transactions);
+            let _ = bank.try_process_transactions(transactions.iter());
         }
     }