Look sync fix

[GenerelSchwerz]

Update look sync to:

1. be stricter on pitch changes as well.
2. warn the user if multiple bot.look calls are being made at the same time, as simply returning completion leaves the end result ambiguous. Ideally, we'd throw an error instead to dissuade bad coding practice, but that feels too opinionated.

Implementation based on: https://github.com/nxg-org/mineflayer-util-plugin/blob/master/src/movementFunctions.ts , where this code does correctly sync sent packet data and expected look return timing.