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/WebGPU/ShaderCompilerWebGPU.Build.cs

@@ -0,0 +1,57 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+using System.IO;
+using Flax.Build;
+using Flax.Build.NativeCpp;
+
+/// <summary>
+/// WebGPU shaders compiler module.
+/// </summary>
+public class ShaderCompilerWebGPU : ShaderCompiler
+{
+    public static bool Use(BuildOptions options)
+    {
+        // Requires prebuilt tint executable in platform ThirdParty binaries folder
+        // https://github.com/google/dawn/releases
+        // License: Source/ThirdParty/tint-license.txt (BSD 3-Clause)
+        switch (options.Platform.Target)
+        {
+        case TargetPlatform.Windows:
+            return options.Architecture == TargetArchitecture.x64;
+        case TargetPlatform.Linux: // TODO: add Linux binary with tint
+        case TargetPlatform.Mac:
+            return options.Architecture == TargetArchitecture.ARM64;
+        default:
+            return false;
+        }
+    }
+
+    /// <inheritdoc />
+    public override void Setup(BuildOptions options)
+    {
+        base.Setup(options);
+
+        options.PublicDefinitions.Add("COMPILE_WITH_WEBGPU_SHADER_COMPILER");
+        options.PublicDependencies.Add("ShaderCompilerVulkan");
+
+        // Deploy tint executable as a dependency for the shader compilation from SPIR-V into WGSL
+        // Tint compiler from: https://github.com/google/dawn/releases
+        // License: Source/ThirdParty/tint-license.txt (BSD 3-Clause)
+        var depsRoot = options.DepsFolder;
+        switch (options.Platform.Target)
+        {
+        case TargetPlatform.Windows:
+            if (options.Architecture == TargetArchitecture.x64)
+                options.DependencyFiles.Add(Path.Combine(depsRoot, "tint.exe"));
+            break;
+        case TargetPlatform.Linux:
+            if (options.Architecture == TargetArchitecture.x64)
+                options.DependencyFiles.Add(Path.Combine(depsRoot, "tint"));
+            break;
+        case TargetPlatform.Mac:
+            if (options.Architecture == TargetArchitecture.ARM64)
+                options.DependencyFiles.Add(Path.Combine(depsRoot, "tint"));
+            break;
+        }
+    }
+}