Add device change trigger support in triggers.yaml

- Introduced a new trigger for device changes to enhance the integration's capabilities.
- Updated the triggers.yaml file to include the 'device_changed' rule so HA properly registers the new trigger.

Author: sirkirby

custom_components/unifi_network_rules/triggers.yaml

@@ -1,4 +1,5 @@
 rule_enabled: {}
 rule_disabled: {}
 rule_changed: {}
-rule_deleted: {} 
+rule_deleted: {} 
+device_changed: {}