WebGPU: Add deprecation warning to wgpuAdapterGetProperties (emscripten-core#22088)

wgpuAdapterGetProperties() previously didn't work anyway - it just returned
zeroes. Use wgpuAdapterGetInfo() instead (once adapter.info is available in
browsers), which is fully implemented, and matches the JS API more closely.

Author: beaufortfrancois

src/library_webgpu.js

@@ -2587,7 +2587,10 @@ var LibraryWebGPU = {
     {{{ makeSetValue('info', C_STRUCTS.WGPUAdapterInfo.deviceID, '0', 'i32') }}};
   },
 
+  wgpuAdapterGetProperties__deps: ['$warnOnce'],
   wgpuAdapterGetProperties: (adapterId, properties) => {
+    warnOnce('wgpuAdapterGetProperties is deprecated, use wgpuAdapterGetInfo instead');
+
     {{{ gpu.makeCheckDescriptor('properties') }}}
     {{{ makeSetValue('properties', C_STRUCTS.WGPUAdapterProperties.vendorID, '0', 'i32') }}};
     {{{ makeSetValue('properties', C_STRUCTS.WGPUAdapterProperties.vendorName, '0', 'i32') }}};