[WIP] Add chroot build feature

[androw]

This is a first try at adding the build in chroot feature in yay.
At the moment, it builds fine if no dependency from AUR is needed.
If someone has a idea to fix this last bit, I'm open to suggestion.
Edit: deps now correctly built

Inspired by paru

[Jguer]

This is a nice feature, the AUR struggles with some chroot building so I'm not sure it can ever be the default (plus caching).

If this reaches completion with AUR dep and coverage I think it should be maintainable enough to merge

[radiooperator-19]

I found out yay seems to compile most packages well in chroot, but I need to su to another user (throws fatal: cannot change to '/tmp/yay': No such file or directory error when trying to build as root)

[androw]

Deps should now be built and installed in the chroot before building the target pkg if someone wants to test.