[breaking] Add binding arrays to WGPUBindGroupLayoutEntry (#530)

Based on
https://github.com/gpuweb/gpuweb/blob/main/proposals/sized-binding-arrays.md

- [x] but with: gpuweb/gpuweb#5174

Fixes #387
(dawn issue https://crbug.com/415092021)

Author: kainino0x

webgpu.h

@@ -3767,6 +3767,12 @@ typedef struct WGPUBindGroupLayoutEntry {
      * The `INIT` macro sets this to @ref WGPUShaderStage_None.
      */
     WGPUShaderStage visibility;
+    /**
+     * If non-zero, this entry defines a binding array with this size.
+     *
+     * The `INIT` macro sets this to `0`.
+     */
+    uint32_t bindingArraySize;
     /**
      * The `INIT` macro sets this to zero (which sets the entry to `BindingNotUsed`).
      */
@@ -3792,6 +3798,7 @@ typedef struct WGPUBindGroupLayoutEntry {
     /*.nextInChain=*/NULL _wgpu_COMMA \
     /*.binding=*/0 _wgpu_COMMA \
     /*.visibility=*/WGPUShaderStage_None _wgpu_COMMA \
+    /*.bindingArraySize=*/0 _wgpu_COMMA \
     /*.buffer=*/_wgpu_STRUCT_ZERO_INIT _wgpu_COMMA \
     /*.sampler=*/_wgpu_STRUCT_ZERO_INIT _wgpu_COMMA \
     /*.texture=*/_wgpu_STRUCT_ZERO_INIT _wgpu_COMMA \

webgpu.yml

@@ -1681,6 +1681,10 @@ structs:
           TODO
         type: bitflag.shader_stage
         default: none
+      - name: binding_array_size
+        doc: |
+          If non-zero, this entry defines a binding array with this size.
+        type: uint32
       - name: buffer
         doc: |
           TODO