feat(config)!: Improve config module resolution

The new system is slightly less flexible, but the code and lua
definitions is now a lot simpler and easier to understand.
In fact the old lua definition was not actually correct.

It is likely that existing configs require not/minimal tweaks to work
again.

src/bin/automation.rs

@@ -140,10 +140,9 @@ async fn app() -> anyhow::Result<()> {
 
     let mqtt_client = mqtt::start(config.mqtt, &device_manager.event_channel());
 
-    if let Some(modules) = config.modules {
-        for device in modules.setup(&lua, &mqtt_client).await? {
-            device_manager.add(device).await;
-        }
+    let resolved = config.modules.resolve(&lua, &mqtt_client).await?;
+    for device in resolved.devices {
+        device_manager.add(device).await;
     }
 
     start_scheduler(config.schedule).await?;