Various small improvements and validations to WebGPU rendering

[mvaligursky]

• shader processor handles the same uniform coming from vertex and fragment shader by de-duplication
• validation of vertex format support on WebGPU (at some point we might need to add workaround for these when loading glbs with the format)
• grab texture sampling temporary fix, might need to create some wrapper function for this in the future

And this now works

refraction.mov

[slimbuck]

wow this awesome!

think I can see twinkles - mipmaps not yet supported?

[mvaligursky]

Yep, no mipmaps .. WebGPU does not have generateMipmaps function, and that needs to be done by rendering down the mipmaps chain. Leaving that for later.