[FR]: Add support for buf plugins to the buf linter

### What is the current behavior?

buf supports plugins, which I use in my repository. They are built as separate Go binaries that are specified via a path in buf.yaml. Unfortunately, there is no way to get these in as dependencies in the current implementation of buf_lint_action, because there are no ways to specify dependencies for the rule or the aspect.

### Describe the feature

I just need some way to be able to use a buf plugin, especially one that already exists as a target in my repository (though I imagine others would want to be able to download and compile them from an external repository, as well).

Start by locating buf_lint_action and reading how the rule and aspect declare dependencies; use buf.yaml as the configuration entry point. Determine how an existing repository target can provide the Go plugin and define completion as the buf linter being able to load and run that plugin.

Written by the indexing model from the issue text.