feat: 修复RHI渲染循环问题

- 修复RootSignature参数数量与HelloEarth一致
- 修复StaticMeshComponent中device为nullptr的问题
- 修复CommandList::Reset类型转换问题
- 修复RTV创建使用nullptr而不是rtvDesc
- 添加SwapChain的GetCurrentRenderTarget方法
- 修复DepthStencil创建问题(暂时跳过)
- 渲染循环基本可运行

engine/include/XCEngine/RHI/IRHIResources.h

@@ -51,6 +51,8 @@ public:
     virtual bool Resize(uint32_t width, uint32_t height) = 0;
     virtual uint32_t GetCurrentBufferIndex() const = 0;
     virtual void* GetBuffer(uint32_t index) = 0;
+    virtual void* GetCurrentRenderTarget() = 0;
+    virtual void* GetDepthStencil() = 0;
     virtual void SetFullscreen(bool fullscreen) = 0;
     virtual bool IsFullscreen() const = 0;
 };