Accountsdb plugin transaction part 3: Transaction Notifier (#21374)

The TransactionNotifierInterface interface for notifying transactions.
Changes to transaction_status_service to notify the notifier of the transaction data.
Interface to query the plugin's interest in transaction data

accountsdb-plugin-manager/src/lib.rs

@@ -3,3 +3,4 @@ pub mod accountsdb_plugin_manager;
 pub mod accountsdb_plugin_service;
 pub mod slot_status_notifier;
 pub mod slot_status_observer;
+pub mod transaction_notifier;