feat(meshlet): refactor meshlet pipeline & add benchmark

Refactor meshlet build pipeline for robustness and performance.
Rename DxcShaderCompiler to DXCShaderCompiler. Enhance meshlet
data structures with bounds and LOD info. Add fallback mesh
simplification. Remove obsolete MeshRenderPass. Add
MeshoptBenchmark for meshlet build performance. Update mesh
import utilities for correct handedness. Minor bug fixes and
code cleanups.

src/Runtime/Ghost.Graphics.D3D12/DxcShaderCompiler.cs

@@ -14,7 +14,7 @@ using static TerraFX.Interop.DirectX.DXC;
 
 namespace Ghost.Graphics.Core;
 
-internal sealed partial class DxcShaderCompiler
+internal sealed partial class DXCShaderCompiler
 {
     private static string GetProfileString(ShaderStage stage, CompilerTier version)
     {
@@ -149,7 +149,7 @@ internal sealed partial class DxcShaderCompiler
     }
 }
 
-internal sealed unsafe partial class DxcShaderCompiler : IShaderCompiler
+internal sealed unsafe partial class DXCShaderCompiler : IShaderCompiler
 {
     private UniquePtr<IDxcCompiler3> _compiler;
     private UniquePtr<IDxcUtils> _utils;
@@ -159,7 +159,7 @@ internal sealed unsafe partial class DxcShaderCompiler : IShaderCompiler
 
     private bool _disposed;
 
-    public DxcShaderCompiler()
+    public DXCShaderCompiler()
     {
         // Initialize DXC _compiler.Get() and _utils.Get()
         var dxccID = CLSID.CLSID_DxcCompiler;
@@ -176,7 +176,7 @@ internal sealed unsafe partial class DxcShaderCompiler : IShaderCompiler
         _compiledResults = new Dictionary<Key64<ShaderVariant>, GraphicsCompiledResult>();
     }
 
-    ~DxcShaderCompiler()
+    ~DXCShaderCompiler()
     {
         Dispose();
     }