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.RenderGraph.Concept/ResourceDescriptor.cs

@@ -0,0 +1,28 @@
+namespace Ghost.RenderGraph.Concept;
+
+public enum ResourceType
+{
+    Texture,
+    Buffer
+}
+
+public enum TextureFormat
+{
+    RGBA8,
+    RGBA16F,
+    RGBA32F,
+    Depth32F,
+    R32Uint
+}
+
+public record TextureDescriptor(
+    int Width,
+    int Height,
+    TextureFormat Format,
+    string DebugName = "Unnamed Texture"
+);
+
+public record BufferDescriptor(
+    int SizeInBytes,
+    string DebugName = "Unnamed Buffer"
+);