Escape from the Void with Totem of Undying

This data pack can save you when you fall into the void.
It would teleport you to the top of the world,and give you slow falling effect so that you can go back safely.
Totem of undying would be destroyed after being used(of course).
Original usage of the totem is NOT changed.
This is a fabric re-implementation of this PMC Datapack with many optimizations that are impossible in a datapack.