[WebGPU] Chrome 134 support for subgroups feature

[chrisdavidmills]

See https://developer.chrome.com/blog/new-in-webgpu-134#improve_machine-learning_workloads_with_subgroups and https://chromestatus.com/feature/5126409856221184 for full details

• Update https://developer.mozilla.org/en-US/docs/Web/API/GPUSupportedFeatures to include an entry for subgroups in the features table.
• Update https://developer.mozilla.org/en-US/docs/Web/API/GPUAdapterInfo to include pages for subgroupMinSize and subgroupMaxSize
• Update BCD to indicate support for the above features in GPUSupportedFeatures and GPUAdapterInfo.

[chrisdavidmills]

Content: #38633

[chrisdavidmills]

BCD: mdn/browser-compat-data#26220