Add shader compiler for WebGPU

Use existing Vulkan compiler to generate SPIR-V and convert it into WGSL with tint compiler
https://github.com/google/dawn/releases/tag/v20260219.200501

Source/Engine/ShadersCompilation/Vulkan/ShaderCompilerVulkan.h

@@ -5,6 +5,13 @@
 #if COMPILE_WITH_VK_SHADER_COMPILER
 
 #include "Engine/ShadersCompilation/ShaderCompiler.h"
+#include <vector>
+
+namespace glslang
+{
+    class TShader;
+    struct SpvOptions;
+}
 
 /// <summary>
 /// Implementation of shaders compiler for Vulkan rendering backend.
@@ -30,6 +37,11 @@ protected:
     // [ShaderCompiler]
     bool CompileShader(ShaderFunctionMeta& meta, WritePermutationData customDataWrite = nullptr) override;
     bool OnCompileBegin() override;
+
+protected:
+    virtual void InitParsing(ShaderCompilationContext* context, glslang::TShader& shader);
+    virtual void InitCodegen(ShaderCompilationContext* context, glslang::SpvOptions& spvOptions);
+    virtual bool Write(ShaderCompilationContext* context, ShaderFunctionMeta& meta, int32 permutationIndex, const ShaderBindings& bindings, struct SpirvShaderHeader& header, std::vector<unsigned>& spirv);
 };
 
 #endif