Add support for WGSL subgroup operations (shader-slang#6213)

* initial work

* more work

* more work on glsl intrinsics

* add subgroup broadcast for glsl

* wip add wgsl extension tracking

* enable tests, enable extensions and added some todos

* format and warning fixes

* fix wgsl extension tracker

---------

Co-authored-by: Yong He <yonghe@outlook.com>

Author: fairywreath

docs/user-guide/a3-02-reference-capability-atoms.md

@@ -788,6 +788,9 @@ Compound Capabilities
 `cuda_glsl_hlsl_spirv`
 > CUDA, GLSL, HLSL, and SPIRV code-gen targets
 
+`cuda_glsl_hlsl_spirv_wgsl`
+> CUDA, GLSL, HLSL, SPIRV, and WGSL code-gen targets
+
 `cuda_glsl_hlsl_metal_spirv`
 > CUDA, GLSL, HLSL, Metal, and SPIRV code-gen targets
 
@@ -830,6 +833,9 @@ Compound Capabilities
 `glsl_spirv`
 > GLSL, and SPIRV code-gen targets
 
+`glsl_spirv_wgsl`
+> GLSL, SPIRV, and WGSL code-gen targets
+
 `hlsl_spirv`
 > HLSL, and SPIRV code-gen targets