Support "uniform texel buffer" and "storage texel buffer" ? #162

• Uniform texel buffers permit loads on a buffer view, with value-conversion similar to image reads. See Vulkan's 13.1.5 Uniform Texel Buffer

  • If supported, then enable the SampledBuffer capability in the WebGPU env spec for SPIR-V

• Storage texel buffers permit loads and stores on a buffer view, with value-conversion similar to image reads and writes. See Vulkan's 13.1.6 Storage Texel Buffer

  • If supported, then enable the ImageBuffer capability in the WebGPU env spec for SPIR-V

I don't have an opinion on whether these should be supported by WebGPU, and I didn't see an investigation related to this.