feat: Add python client for remote registry server

[tokoko]

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What this PR does / why we need it: Adds another registry that wraps grpc calls to remote registry server. The registry is called remote (best i managed to come up with) and can be configured from feature_store.yaml like this:

registry:
    registry_type: remote
    path: localhost:6570

Both registry server and remote registry are still read-only for now. I also decided to skip implementing cache for the time being. I plan to add caching once #3940 gets resolved.