feat!: Improve lua module registration

Instead of having to call all the module registration functions in one
place it is possible for each module to register itself in a global registry.
During startup all the all the modules will be registered
automatically.

This does currently have one weakness, to need to ensure that the crate
is linked.

automation_lib/Cargo.toml

@@ -11,6 +11,7 @@ dyn-clone = { workspace = true }
 futures = { workspace = true }
 google_home = { workspace = true }
 indexmap = { workspace = true }
+inventory = { workspace = true }
 mlua = { workspace = true }
 rumqttc = { workspace = true }
 serde = { workspace = true }