Linting

There is some discussion on the buck2 discord about best practices with linting and how to scale linting at smaller repo scales vs massive monorepos. The expectation of a massive monorepo tends to be that you have linters run on a CL upload. That works well with infra, but doesn't scale down to early stage open source projects.

Similar to RunInfo/DefaultInfo/InstallInfo, would there be any willingness to support something like a `LintInfo` that toolchains could use? This would allow folks to leverage the files changed graph that buck2 already has, and allow folks to drop into arbitrary buck2 projects and know how linting works.