Refactor GPU resource management and rendering pipeline

- Introduced `Handle<T>` and `Identifier<T>` for lightweight, strongly-typed resource identifiers.
- Replaced `BitSet` with `UnsafeBitSet` for improved performance and memory safety.
- Refactored `Mesh` and `Material` into `MeshClass` and `MaterialClass` for better GPU resource handling.
- Added `D3D12ResourceDatabase` to centralize GPU resource tracking and lifecycle management.
- Updated `D3D12ShaderCompiler` to load shaders from disk and dynamically populate constant buffers and textures.
- Enhanced `ICommandBuffer` with new upload operations for buffers and textures.
- Refactored `Vertex` struct for simplified memory layout and better performance.
- Updated `MeshBuilder` and rendering logic to align with new resource and shader structures.
- Added `BindlessDescriptor` support to `TextureHandle` and `BufferHandle`.
- Removed unused classes and performed general cleanup.
- Updated unit tests and demos to reflect the new architecture.

Ghost.Graphics/RHI/IRenderTypes.cs

@@ -173,7 +173,8 @@ public struct RenderTargetDesc
             Format = desc.Format,
             Dimension = desc.Dimension,
             MipLevels = desc.MipLevels,
-            Usage = usage
+            Usage = usage,
+            CreationFlags = TextureCreationFlags.Bindless
         };
     }
 }
@@ -245,6 +246,15 @@ public struct TextureDesc
         get;
         set;
     }
+
+    /// <summary>
+    /// Texture creation flags
+    /// </summary>
+    public TextureCreationFlags CreationFlags
+    {
+        get;
+        set;
+    }
 }
 
 /// <summary>
@@ -341,3 +351,10 @@ public enum MemoryType
     Upload,     // CPU-to-GPU memory
     Readback    // GPU-to-CPU memory
 }
+
+[Flags]
+public enum TextureCreationFlags
+{
+    None = 0,
+    Bindless = 1 << 0
+}