provide CLI tool to clear any caches

[beckermr]

I don't know how to clear rattler-build's internal caches of downloaded packages, repodata, source code, etc.

There is pixi clean cache, but it is unclear to me how that relates to rattler-build.

[zelosleone]

I think this would be a great idea, we can basically just try to copy what pixi clean does and try to clean the caches for packages, repodata, build and source while providing an all command to clear all cache too. We can just take the --dry-run (show what would be deleted) and --cache-dir <PATH> to specify bld or cache folders to be deleted specially (with include/exclude too maybe? ) @wolfv

[wolfv]

Just like upload this might also be functionality that we could/should move to rattler so that it can be shared by multiple tools.