feat(RHI): add rendering state abstraction to RHICommandList

- Add DepthStencilState and BlendState structs to RHICommandList
- Add SetPrimitiveTopology, SetDepthStencilState, SetStencilRef,
  SetBlendState, SetBlendFactor virtual methods
- Implement new methods in OpenGL backend with full state control
- Implement stub methods in D3D12 backend (states controlled via PSO)

engine/src/RHI/D3D12/D3D12CommandList.cpp

@@ -256,10 +256,6 @@ void D3D12CommandList::SetStencilRef(uint32_t stencilRef) {
     m_commandList->OMSetStencilRef(stencilRef);
 }
 
-void D3D12CommandList::SetBlendFactor(const float blendFactor[4]) {
-    m_commandList->OMSetBlendFactor(blendFactor);
-}
-
 void D3D12CommandList::SetDepthBias(float depthBias, float slopeScaledDepthBias, float depthBiasClamp) {
 }