(Java-parity) Add in-game resourcepack change menu!

It would be a game changer, to add in-game resourcepack loading and disloading menu (for bedrock) without requiring the player to leave and rejoin. With a reload command sothat textures can be reloaded. Just like in Java! And Don't forget to make those features Accessible by serverside operations, so minecraft plugins devolopers can change the server texture pack for a significant player via plugings.