DimensionType and LevelStem API - #12119
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Lets you create custom dimension types and levelstems. This hooks into the vanilla way of creating new dimensions by modifing the levelstem registry.
This can easily be used to just break worlds as you can modify existing worlds, like change the overworld to use the nether-like chunk generator and the overworld will just switch.
Resolves #12110
I like the pattern I added here for
copyGeneratorFromsince I don't want to add all needed API to create instances of chunk generators, so this just allows you to copy it from elsewhere. We can use this in future registry API when we don't want to go all the way.