Cosmos-sdk: Disable protobuf lint on third party proto files

[colin-axner]

Summary

I noticed #6926 adding the ics23 proto file causes the protobuf lint to break. I think we should update the protobuf lint to exclude certain proto files.

Problem Definition

We are importing third_party proto files that are not guaranteed to be properly linted. The test will break and no longer be useful.

Proposal

Lint our own proto files and maybe third party proto files we have control over

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[alexanderbez]

I think we just need to update the buf configuration here?

[marbar3778]

https://github.com/cosmos/cosmos-sdk/blob/4e73e0f817b3e9ab75937c705fb49c6e5ae99eb0/buf.yaml#L17-L20 to something like:

ignore:
  - third_party/proto 

should do the trick and we shouldn't have to keep updating the list