Add support for lightmap textures to the WebGPU renderer #350
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This doesn't do much on its own, but allows uploading the UVs.
Again this is useless on its own, but allows materials to implement the actual support for lightmaps if they need it.
These should be replaced with the actual lightmap texture later, and of course they aren't yet used by the shaders (or even supported by the material bindings).
Required to bind the placeholder texture in the render loop.
It's a bit sketchy and not-at-all general to use the transform slot, but I don't think it matters since lightmaps are a terrain-only feature.
Obviously not the right method for actual lightmaps (placeholder).
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Very basic and using some placeholders for the lightmap texture and UVs. Needs adjustments to the sampling method, as well.
Resolves #131.