[WebGPU] Add support for new unorm10-10-10-2 vertex format

[chrisdavidmills]

See https://developer.chrome.com/blog/new-in-webgpu-119#unorm10-10-10-2_vertex_format for change description

Acceptance criteria

• Add a BCD data point for this change (to GPUDevice.createRenderPipeline and GPUDevice.createRenderPipelineAsync) — this shipped in Chrome 119. I think this is probably enough — we don't document all the vertex formats on MDN as there are so many of them; we just point to the list in the spec (see https://developer.mozilla.org/en-US/docs/Web/API/GPUDevice/createRenderPipeline#format_3)