Add render graph proof of concept and refactor graphics

Implemented a transient render graph system as a proof of concept, including resource aliasing, pass culling, and typed pass data. Added new project `Ghost.RenderGraph.Concept` targeting `.NET 10.0`.

Refactored graphics-related components:
- Simplified resource state transitions in `RenderingContext`.
- Improved resize handling in `GraphicsTestWindow`.
- Updated `D3D12GraphicsEngine` to streamline frame rendering.
- Enhanced `D3D12ResourceDatabase` and `D3D12SwapChain` for better resource management.

Added detailed documentation:
- `ALIASING.md` explains resource aliasing techniques.
- `API_DESIGN.md` outlines the render graph API design.

Updated solution to include the new render graph project.

Ghost.Graphics/RHI/ISwapChain.cs

@@ -24,14 +24,6 @@ public interface ISwapChain : IDisposable
         get;
     }
 
-    /// <summary>
-    /// Number of back buffers
-    /// </summary>
-    public uint BufferCount
-    {
-        get;
-    }
-
     /// <summary>
     /// Gets the current back buffer texture
     /// </summary>