Nested options

### I am planning on implementing this myself

Yes

### Describe your request

When you installed too many mods, there will be lots of options to find. There's already a search feature that allows to search between those, but you still have to look through all the options when you don't know which word should be searched. So maybe we can introduce a new feature that nest those options grouped by mods.

### Additional context

Effect:

Question:

1. Should it have an animation when entering a mod's options?
> If it's in-game, then no surely, but what if it's in OUI? UI switches in Overworld have an animation like "fly out and then fly in". ExtendedVariantMode has it, but when you entered its submenus away from options oui, the settings is saved somehow.
> So it should have an animation in OUI but don't in-game?

2. Should it be implemented into Everest?
> If shouldn't, then how can we design new APIs that allow mods to implement this feature?