(Bedrock Parity) Custom UIs for Java

As I've been working on a minigames server, there's only so many choices when you want to display something and most places you want to display something it has to be text and being able to display an image or add some buttons that aren't just Items in a chest UI. I think that's really the only thing I really like from the bedrock side of things as it give a lot more control over what you want and reduces the need for a super large UI that displays non important things (Like your Inventory).

Some nice additions that I think would be useful related to Custom UIs to the Java Server Community: Sliders, Buttons, Dynamic Streaming/Loading of audio/(or just a better way of seamlessly applying a resource pack that only contains sounds or such, unloading of resource packs without sending a blank one from the server).

This of course doesn't have to be exclusive to servers as it could integrated into data packs so you don't have rely on using commands so much.

I'm sure a lot more could be added on top of this but this is just a kind of basic set of things I think should be added related to custom ui's.