Deploy other Firebase project assets (like security rules)

Do you plan to integrate the deployment of a project's assets (functions, rules, indexes, etc.) as well? This is something other GitHub actions (e.g. [w9jds/firebase-action](https://github.com/w9jds/firebase-action)) support, but there's no information whether this is or will be supported by this action.

This was already mentioned in a [comment of an issue](https://github.com/FirebaseExtended/action-hosting-deploy/issues/44#issuecomment-718786569) that covers another topic.