Suggestion: add custom resource packs support

[lightyisreal]

Since on some consoles like the PS4, PS5 and Switch you can't import your packs like on Xbox consoles, it would be nice if you could inject your own packs below the server ones so you can use custom packs without any issues. Even though there's the resource pack cache trick that may be useful, it's not that simple to do this for every server you play on.