Refactored and renamed components related to D3D12 graphics programming, replacing "descriptor" with "viewGroup" to improve resource grouping and management. Updated `D3D12CommandBuffer`, `D3D12DescriptorAllocator`, and `D3D12PipelineLibrary` to reflect these changes. Simplified material and shader creation in `D3D12ResourceAllocator`. Enhanced `D3D12ResourceDatabase` with resource naming for debugging and improved management. Refactored `Shader` and `ShaderPass` to use modern C# features and `IResourceReleasable` interface. Introduced `D3D12Utility` for centralized utility methods. Updated `Material` class for efficient buffer creation. Renamed `ShaderCompiler` to `SDLCompiler` with improved error handling. Updated `MeshRenderPass` to use new shader compilation process. Various improvements in error handling, code readability, and utility methods.
- 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.
