Initial checkin for Query support for HDS.

HDSQueryOperator  which extends HDSOutputOperator and adds support for querying
ApplicationWithHDSQuery application with kafka integration (not tested).
HDSQueryOperatorTest to unittest HDSQueryOperator class.

Pending
- Query Expiration.
- Handling timeseries (multiple point queries).
Remove timing dependency. Synchronous executor is used elsewhere to avoid this in the operator level test.