Breaking block animation

[TheDuckCow]

The goal: To integrate Roni's nice contribution of a break block shader group for materials, first posted here. See also here the video on how to use it as-is. Source blend link.

There are a few ways to do this:

1. Make this available as a "meta material" in MCprep materials
2. Make a function for specifically adding the "cracked" effect to a material
3. Integrate this as part of the effects spawner (planned), which will have many specialized integrations like this one depending on the effect.
4. Just generally provide it as an available node group in material shaders, so someone can use it as needed (easiest approach, but non obvious to the user it is there).