Make query service topology aware from 7.1.0

As per our discussion on July 19-2021, for the graceful exit of query service, we need query to be added as a topology-aware service.

This is needed for cluster-aware rebalance feature for query, wherein if a node with query service is rebalanced, we want to 

1.Complete all queries in progress (instead of shutting down immediately)

2.Wait for the in-flight transactions to complete

3.Not accept any new requests