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_bridge.rs

@@ -35,6 +35,7 @@ pub struct Config {
 pub struct HueBridge {
     config: Config,
 }
+crate::register_device!(HueBridge);
 
 #[derive(Debug, Serialize)]
 struct FlagMessage {