Add texture_and_sampler_let language feature.

Add support for the `texture_and_sampler_let` language feature.

Spec PR: gpuweb/gpuweb#5339

Author: dj2

webgpu.h

@@ -1244,6 +1244,10 @@ typedef enum WGPUWGSLLanguageFeatureName {
     WGPUWGSLLanguageFeatureName_PointerCompositeAccess = 0x00000004,
     WGPUWGSLLanguageFeatureName_UniformBufferStandardLayout = 0x00000005,
     WGPUWGSLLanguageFeatureName_SubgroupId = 0x00000006,
+    /**
+     * Allow textures and samplers to be assigned in a let expression.
+     */
+    WGPUWGSLLanguageFeatureName_TextureAndSamplerLet = 0x00000007,
     WGPUWGSLLanguageFeatureName_Force32 = 0x7FFFFFFF
 } WGPUWGSLLanguageFeatureName WGPU_ENUM_ATTRIBUTE;
 

webgpu.json

@@ -1513,6 +1513,9 @@ enums:
       - name: subgroup_id
         doc: |
           TODO
+      - name: texture_and_sampler_let
+        doc: |
+          Allow textures and samplers to be assigned in a let expression.
 bitflags:
   - name: buffer_usage
     doc: |