Refactor Render Graph: unified resources, benchmarking

Major overhaul of Render Graph system:
- Replaced texture handles with generic Identifier<T> for unified, type-safe resource management (textures, buffers, etc.)
- Refactored resource registry and pooling for performance and extensibility
- Added AccessFlags and TextureAccess for precise resource usage tracking
- Split passes into Raster and Compute types; introduced builder interfaces for safer pass construction
- Modernized pass setup API (SetColorAttachment, UseTexture, etc.)
- Updated command buffer and context structs to use new resource system
- Refactored barrier and aliasing logic for improved correctness
- Integrated BenchmarkDotNet for performance/memory benchmarking
- Improved blackboard type safety and removed obsolete code/extensions
- Added BenchmarkDotNet NuGet package

These changes make the Render Graph more extensible, efficient, and ready for future resource types and advanced features.

Ghost.RenderGraph.Concept/Ghost.RenderGraph.Concept.csproj

@@ -16,6 +16,10 @@
     <DefineConstants>$(DefineConstants);PROFILING</DefineConstants>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.8" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\Ghost.Core\Ghost.Core.csproj" />
   </ItemGroup>