[JS/WebGPU] Creating devices with subgroup features enabled if possible (microsoft#21833)

This CL make WebGPU backend support subgroup features and thus allow
using subgroup optimizations in the future.

### Description
With this CL WebGPU backends will create devices with subgroups and
subgroups-f16 features (both are under origin trial in Chrome) or
chromium-experimental-subgroups feature enabled whenever available.

### Motivation and Context
This CL would allow WebGPU operator shaders to use subgroup
optimizations in the future, and might get some significant speedup with
these optimization.

Author: jiangzhaoming

js/web/lib/wasm/jsep/init.ts

@@ -94,6 +94,7 @@ class ComputeContextImpl implements ComputeContext {
     contextDataOffset: number,
   ) {
     this.adapterInfo = backend.adapterInfo;
+    this.deviceInfo = backend.deviceInfo;
 
     // extract context data
     const ptrSize = module.PTR_SIZE;