Add support for world gen datapacks

[vanvac]

Would be nice to see if world gen datapacks could be supported idk if cubiomes supports world gen data packs so this might not be possible also the new version dosen't yet support terrian gen so this might be kinda useless for now.

If it dose get implemented i think it should either be a configuration throught /cconfig SeedMapper or a setting in the /sm:source
so like /sm:source datapacked <datapack link/dir>

I dont expect this to be inlemented its just a suggestion i had because https://mcseedmap.net/1.21.0-Java/0 mcseedmap.net has an implementaion of it and they use cubiomes so i was wondering if it would be possible here