* Added applier side TOI commit order enter and leave

* Added cleanup_transaction() method to client_service in order to
  provide a way to make DBMS side cleanup when transaction
  is cleaned up

dbsim/db_client_service.hpp

@@ -50,6 +50,8 @@ namespace db
             return 0;
         }
 
+        void cleanup_transaction() override { }
+
         size_t bytes_generated() const override
         {
             return 0;