Support plugin-specific rule links

[ckohnert]

Feature

It looks like the buf lsp hardcodes annotation rule links to https://buf.build/docs/lint/rules/#<ruleID> which doesn't make sense for plugin-provided annotations. Ideally the annotation serialization format supports providing both a "sub rule" and the link to the rule documentation. For example, here is the output for a wrapper plugin I wrote for AIP's api-linter, but I'm unable to link to the real rule because it's hidden behind the bufplugin protocol.

I'm happy to try and contribute a fix for this, but wanted to make sure this is something folks wanted to support.

[stefanvanburen]

hey @ckohnert, agreed that we ought to not hardcode the links for rules from custom plugins. It'd be nice to fix the handling there to skip those custom rules.

In terms of the custom URL for rule documentation, I think that would probably be a feature request on the upstream https://github.com/bufbuild/bufplugin-go repository?

[stefanvanburen]

Put up #4423 to fix that first bit.

[ckohnert]

Great, I've opened bufbuild/bufplugin#15 as the next step. Once that's landed, I'm happy to submit additional PRs to bufplugin-go and then here to get this working.