Feat: Protobuf Lint CI

[gluax]

Motivation

To lint the protobuf files.

Explanation of Changes

1. Added a lint and fmt check for protobuf only in a new lint job in test.yml.
2. Fixed all the linter issues with the protobuf.
   I tried my best to comment on all the protobuf appropriately(required by the linter), but lmk if there's some way to better comment it.
3. Regenerated the go files from the protobuf.

Testing

Tested in my private repo that the CI works(passes and fails) as expected.

Related PRs and Issues

Closes #64

[gluax]

Here's the lint job for those curious :D.

[hacheigriega]

This conflicts with PR #149

[jim380]

I'd say this PR is complementary to #149 as 149 doesn't handle proto lint. Though I have not seen many chains putting proto lint in CI.