Automate patching of proto files

[hu55a1n1]

Summary

The proto files generated by the proto-compiler do not compile out-of-the-box (see https://github.com/informalsystems/ibc-rs/issues/1374). They also include some unused files (see comment from @mzabaluev https://github.com/informalsystems/ibc-rs/pull/2278#pullrequestreview-1000923095). We currently fix these problems manually but would be great if we could automate them.

Proposal

We could update the sync-protobuf.sh script or the Proto-compiler crate to automatically fix these problems.

Acceptance Criteria

The patching process is automated.

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