Add xpPerSculkCatalyst rule

[Ghoulboy78]

Fixes #269 Basically adds the rule

[James103]

I tested this and it works properly. Some observations made during testing:

• If xpPerSculkCatalyst is negative, the behavior is the same as if the value was just set to zero.
• The rule works all the way up to the 32-bit integer limit, though at very high values (greater than about 4.34M) the server may lag every time someone breaks a Sculk Catalyst, with carpet xpNoCooldown true alleviating some of that if the player is nearby.