GFX control, no-tokio, no-async, dbus client refactor

- Working gfx modes <iGPU only, dGPU only, or hybrid>
- Add signal for gfx vendor change and make CLI wait for signal
- Add polling for led brightness to save to config
- Move daemon to zbus crate
- dbus client refactor
- Further dbus methods and updates
- Add basic notification user daemon and systemd service

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-members = ["asus-nb-ctrl", "asus-nb"]
+members = ["asus-notify", "asus-nb-ctrl", "asus-nb", "ctrl-gfx"]
 
 [profile.release]
 lto = true
@@ -13,4 +13,4 @@ opt-level = 1
 
 [profile.bench]
 debug = false
-opt-level = 3
+opt-level = 3