Normal Map to Height Map Node

[Kim2091]

Motivation
Allow users to create height/displacement maps

Description
This would allow users to generate a height map from a normal map. This can be used in conjunction with chaiNNer's own Normal Map Generator, or dedicated models that generate detailed normal maps

There's a few good implementations out there:
https://stannum.io/blog/0IwyJ-
https://www.reddit.com/r/gamedev/comments/fffskm/convert_normal_map_to_displacement_map/

Alternatives
None