Unlinking Packages in Py-Rattler

[iamthebot]

Checklist

• I added a descriptive title
• I searched open requests and couldn't find a duplicate

What is the idea?

Maybe I'm missing something obvious but via py-rattler there's no ability to unlink (i.e uninstall) a package explicitly. Maybe we can just expose the link_file + unlink_package lower level methods in py-rattler?

Or a cleaner approach might be to expose a high level method to uninstall a package by name/PrefixRecord in Installer.

Why is this needed?

Currently, we handle unlinking ourselves outside of rattler. However, this is something users of py-rattler will want to do routinely.

Happy to take a stab at a PR.

[baszalmstra]

Package can be uninstalled by not including packages when invoking install.

But I think it makes sense to add the lower level link- and unlink package functions to py-rattler.

Happy to accept a PR

[iamthebot]

Started working on a PR for this. Just need to finish some unit tests. Will try to wrap it up tomorrow.