Add pre 1.18 generator to chunk management

Recently Mojang announced the new chunk management feature where you can reset chunks for them to regenerate, and I think they should add an option to generate pre 1.18 chunks (let’s say 1.17) along with the current version chunks because many old players prefer the old generation since it is more flat for building etc and biome edges are much more clear, and just for more variety that you can have for your Minecraft worlds especially since (apparently) it would be easy to implement since they still have the code.