Feature request: mid-room auto-splits for ILs such as Abyss Climb and PoP

[AlexKnauth]

Could go with boring names like AbyssClimbA, PathOfPain1a, etc. or maybe for Abyss Climb there could be names based on the associated points of Void Heart climb, such as NoMind, NoWill, NoVoice, etc. if those end up corresponding to checkpoints that make sense.

Hazard Respawn Boxes seem like logical places to put these, but when these can be skipped, there needs to be care taken to make sure that can't stop a run. For example if someone does Thorn-skip or Thorn-skip-skip in PoP room 3, that skips the Hazard Respawn Box for PathOfPain3a, so there should be an alternative box for that autosplit that splits (or skips?) when someone successfully pulls off one of those skips to get to the wall above.