Shader processor improvements related to bind groups format

[mvaligursky]

• bind group format and bind uniform format classes can now generate relevant shader code blocks
• these are used to generate view uniform code blocks
• shader processor generates new 'mesh' bind group format instances for uniforms not used by other buffers, and generates code from those too

Note: This does not execute on WebGl (currently)

[slimbuck]

Approved with small comment. Just checking, does this code gets stripped out of the built engine? (the webgpu-only stuff)

[mvaligursky]

Approved with small comment. Just checking, does this code gets stripped out of the built engine? (the webgpu-only stuff)

The shader processor is stripped out for now, as its imported only by WebgpuShader, which is not part of the engine yet.
The shader processor options (small data class) is included, as this is used to pass data from forward renderer.