[Cosmos] Hybrid Search query pipeline

[simorenoh]

Adds support for performing full text search queries through the introduction of the hybrid search query pipeline. This consists of the newly added hybrid_search_aggregator, which performs the necessary query steps to obtain the needed results.

With these changes, the SDK can now interpret queries utilizing key functions like FullTextContains(), FullTextContainsAll(), FullTextContainsAny(), Order By Rank <FullTextFunction>(), and Order By Rank RRF().

The design doc for the implementation can be found here: Hybrid Search Doc.
The new README in this PR also has additional information.

Still missing in this PR at the moment:

• Samples for both sync and async
• Tests for both sync and async
• Additional README information on how to run these queries.
• Cleaning up/ aggregating some of the repeated logic.
• Possible optimizations to query plan fetching - will probably be addressed in a separate PR.

[azure-sdk]

API change check

API changes are not detected in this pull request.