For new registry values, allow copying from existing

[Machine-Maker]

Replaces #11724

---

This creates a copy of the power enchant and just changes some things about it. This is useful because you don't have to redefine everything about the other enchant, and it will stay updated to the other enchant's values.

@Override
public void bootstrap(@NotNull BootstrapContext context) {
    // io.papermc.testplugin.brigtests.Registration.registerViaBootstrap(context);

    final TypedKey<Enchantment> NEW = EnchantmentKeys.create(Key.key("mm:test"));
    context.getLifecycleManager().registerEventHandler(RegistryEvents.ENCHANTMENT.freeze(), event -> {
        event.registry().factoryRegistry(
			NEW,
			builderFactory -> builderFactory
				.copyFrom(EnchantmentKeys.POWER)
				.maxLevel(10);
            	.description(text("MOARR POWER")
        );
    });

    context.getLifecycleManager().registerEventHandler(LifecycleEvents.TAGS.preFlatten(RegistryKey.ENCHANTMENT), event -> {
        final PreFlattenTagRegistrar<Enchantment> registrar = event.registrar();
        registrar.addToTag(EnchantmentTagKeys.IN_ENCHANTING_TABLE, List.of(TagEntry.valueEntry(NEW)));
    });
}

[Machine-Maker]

Something I just thought about... perhaps we should "clone" the nms object before pre-filling the builder with it's values. Just so the newly built value doesn't use the instance of all the subtypes. I don't know if it would cause any problems, but to get out ahead of those.

EDIT: Hmm, but it won't be possible with all registry types because only the data-driven ones have direct codecs (you need a direct codec to copy it).