universal-search: Query Group API and local mode

[agourlay]

This PR adds the client API and local mode for the new group query API.

I took the opportunity to increase the gRPC coverage but it seems to create issues with newest Python versions.

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[agourlay]

Dear reviewers, I believe I have addressed all your comments :saluting_face:

[agourlay]

Let's keep this PR open to not make cherry picking too difficult in case of patch release.

We could stack other PRs on top of it for the next release.

[agourlay]

@joein Thanks for handling the merges :clap: