Publish the proto module on BSR

[mzabaluev]

Summary

Publish the ibc proto module on Buf Schema Registry.

Problem Definition

Application developers wishing to use buf to manage the protobuf definitions and their dependencies would benefit from the IBC protobuf files being published on BSR as a module. Case in point: informalsystems/hermes#2199.
As the repository has already been equipped with buf manifests allowing code to be built from the ibc-go repository as an input, it would seem like a logical progression to fully convert the proto files to a module.

Proposal

Replace third_party/proto files with dependencies managed via the buf.yaml file. To generate Go code, define buf.gen.yaml and specify proper use of protoc plugins rather than the current transitional solution invoking buf protoc.
Once the adaptation is done and passes the required lints, push the module to BSR as https://buf.build/cosmos/ibc.

This may need some work on behalf of tendermint, as those proto files are not currently in BSR either, and we don't want to diamond them via cosmos-sdk and ibc-go.

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For Admin Use

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[colin-axner]

I believe this is the same proposal as #808?

In favor of adding our proto files to the buf schema registry 👍

[mzabaluev]

I believe this is the same proposal as #808?

That seems to concern with a particular .proto file, it does not specifically say "make everything properly buf without vendored proto files and push to BSR".

[damiannolan]

closed by #2705