Resource pack overlays (23w31a)

[ShirleyNekoDev]

23w31a > Pack Metadata

Resource pack loading will have to apply overlay directory content depending on the configuration in pack.mcmeta.
Might be helpful for the user to select which minecraft version / resource pack format version to load.

[leMaik]

As an MVP, loading the latest version (basically behave as if we're loading Infinity) should be sufficient. This ensures that we get the resources that the latest game version would get.

Resource pack loading needs some refactoring for #1332 too, so this is a great opportunity to get that out of the block models PR and implement that file resolution properly.