Support KHR_texture_transform extension for Normal and Occlusion textures

[rdeepak2002]

Normal and Occlusion textures can have texture transformations applied to them

• Example: https://github.com/KhronosGroup/glTF-Sample-Assets/tree/main/Models/TextureTransformMultiTest

I've tested these changes in my own game engine and they seem to work:

[alteous]

Thanks for your PR. I would like to hold off merging for now until I have the 2.0 code ready.

[crazyjackel]

I want to express my interest in seeing this added in.

[GitGhillie]

Hi @alteous , is there anything we can do to help out here? Also curious if there is anything preventing this from being merged while 2.0 is being worked on