Report unused dependencies

[borkdude]

Approach, inspired by deps-infer: https://github.com/borkdude/deps-infer

1 Which namespaces are required in paths
2 Lint libraries one by one from deps.edn so we know which namespaces belong to which libraries
3 If there are libraries of which no namespace was used, report them as unused (and/or interactively remove)

/cc @lread Perhaps this seems like a fun issue to look into, no pressure though!

[lread]

Thanks for the ping. It does look interesting, and I just might wander back here to look at it sometime. I won't be offended if someone else beats me to it!

[borkdude]

I'm not sure actually if I want to have this in carve, or clj-kondo proper or in its own project, or perhaps in deps-infer. I'll mark this issue as "hammock".