Add clean cli command

[rxb3rth]

Goals

1. Remove generated files and caches.

Non-Goals

No response

Background

When you are in development, you install multiple packages, make version changes etc. Many of the above remain in cache and produce errors.

Proposal

Adding it to the next cli as a new option.

[gavenkoa]

see #6009 & https://nextjs.org/docs/pages/building-your-application/upgrading/version-11