Use `mypy-protobuf` for better grpc type stubs

[coszio]

This adds mypy type stub generation for better DX with grpc types.

• Adds mypy-protobuf to poetry dev dependencies
• Adds --mypy_out flag to grpc client generator

dev:

PR:

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• [x] Contributions should target the dev branch. Did you create your branch from dev?
• [x] Have you followed the guidelines in our Contributing document?
• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

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[coszio]

Recreated the type stubs with the dev branch of qdrant core

[coszio]

@joein anything against this? Otherwise I think it makes our life easier

[joein]

Let's merge it before 1.11.2, but not right now

[coszio]

I added the mypy stubs in #758, now that this one is approved. To not repeat client generation, I will close this one in favor of the other one.