[Additional Code Formatter] protobuf

[thomas-swirlds-labs]

We want to create a new custom Spotless Protobuf Plugin for Comment Specifications that can be used to inform, lint and format .proto files according to the project's recommended style guidelines
This could be implemented using a Custom Step invoked from this new plugin.

[jjohannes]

Two topics we can do separately

1. Custom format for comments: feat: ProtoCommentLinter and Spotless Custom Step #108
2. Integration of Spotless standard support for Protobuf auto-formatting (baed on buf)