Add ability to enchant an item at a specific level.

[sovdeeth]

Problem

There was no way of replicating the behavior of the vanilla enchanting table without hardcoding weights and chances manually.

Solution

Adds an option to EffEnchant to use ItemFactory#enchantWithLevels (available on paper 1.20.4+), which gives an itemstack a random set of appropriate enchants based on the given level, identical to the behavior of the enchanting table. I did not add the TagKey-based enchant limiting option as I didn't want to get into implementing the key set system and the only option to do it somewhat nicely seems to be reflection.

Testing Completed

manual confirmation

Supporting Information

Enchanting a book at a level returns an enchanted book instead. Support for those should also be added, but is out of scope of this PR.

---

Completes: none
Related: none

[APickledWalrus]

Couple minor thoughts+questions

[APickledWalrus]

Could maybe do getOptionalSingle with -1 as the default value:

Suggested change

	Number levelValue = level.getSingle(event);
	int level = this.level.getOptionalSingle(event).orElse(-1).intValue();

Then you simply check level < 0 as you do now

[sovdeeth]

I think that just makes the code less readable, honestly. Without the optional it's very clear what cases cause failure, but with it you have to keep in mind that -1 is for both null values and truly negative ones.