Is your feature request related to a problem? Please describe.

1.18 does not even have 1.16 and below caves! This is because Mojang redid the API and we commented out the code.

Describe the solution you'd like

We need to most likely delete all of our existing cavegen code and most likely replace it with an exact copy of Mojang's 1.18 cave mechanics if possible. This also means supporting 3d biomes and other things.

Describe alternatives you've considered

Don't update caves, but I feel like that won't make people very happy. We can also implement our own cavegen, but that will probably take more time than ripping Mojang's

Description aka Additional context

I'm assigning this to Super as she knows the most regarding cavegen and other noise things.