Add recordings timeline entry for frigate+ attributes (#8063)

* Add attribute item to timeline

* Add face icon

* Add support for other icons

* Cleanup

* Ensure attributes are only updated once

* don't show _ in attributes

frigate/events/maintainer.py

@@ -42,6 +42,9 @@ def should_update_state(prev_event: Event, current_event: Event) -> bool:
     if prev_event["stationary"] != current_event["stationary"]:
         return True
 
+    if prev_event["attributes"] != current_event["attributes"]:
+        return True
+
     return False