Feature: Create Linux Back-End

There's some really nice tools like Wlgammactl, gamma-relay-rs, etc.

For wayland, they're pretty essential on my system.

I'd like to either use something like this as a back-end, or re-implement into the nightlight rust crate to use on wayland linux. I'm skipping x11 for now.

Also, I haven't checked out the nightlight linux side so idk if it is implemented yet.