Add streaming support and tests for query-server. #1027
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For our upcoming customer deployment, we need a REST server that will return query plans, results, and the set of retrieved docs used in a query. This PR adds this capability to the existing
query-serverapp.I have also added streaming responses using SSE, in order to support streaming back large result sets (and to ensure the query plan and status are streamed back to the client while the query is running). Streaming is enabled if
stream=truein the query request, otherwise, a non-streamed response is returned.I've added a unit test for the app as well.