feat!: Improve device type registration

Instead of one function that contains all the device types available in
`automation_devices` a global registry is used were each device can
register itself.

automation_devices/src/hue_switch.rs

@@ -59,6 +59,7 @@ struct State {
 pub struct HueSwitch {
     config: Config,
 }
+crate::register_device!(HueSwitch);
 
 impl Device for HueSwitch {
     fn get_id(&self) -> String {