Reopen and fix MC-308361 (make certain small sulfur cubes persistent)

MC-308361 needs to be reopened and fixed. Due to this bug, small sulfur cubes that split from bucketed sulfur cubes always despawn whenever the player gets too far away, which breaks game mechanics and is incredibly unintuitive. It forces players to stay around small sulfur cubes after splitting them so that they don't despawn. It is also inconsistent with all other baby mobs and creates frustration and confusion for players who aren't aware of this problem. This bug was unfortunately marked as "works as intended", but it definitely doesn't seem like an intended gameplay feature, especially if you play with sulfur cubes a lot.

Please reopen this and make small sulfur cubes that split from a bucketed sulfur cube persistent. It would also help to make them leashable and bucketable, as well as persistent after given a name tag or slime ball.