PostProcessing | Add post-processing step to generate texture atlasses from materials

[kimkulling]

Is your feature request related to a problem? Please describe.
As a user I shall be able to generate a texture atlas, which shall contain all the textures which are used in the model. All texture coordinates shall be changed.

Describe the solution you'd like
Just do it.

Describe alternatives you've considered
Use an existing solution

Additional context
Prototype is in preparation based on the following blog post: https://lisyarus.github.io/blog/graphics/2022/08/06/texture-packing.html