feat(rendering): add scriptable render context v1

managed/XCEngine.ScriptCore/ScriptableRenderContext.cs

@@ -0,0 +1,23 @@
+namespace XCEngine
+{
+    public sealed class ScriptableRenderContext
+    {
+        private readonly ulong m_nativeHandle;
+
+        internal ScriptableRenderContext(ulong nativeHandle)
+        {
+            m_nativeHandle = nativeHandle;
+        }
+
+        public CameraFrameStage stage =>
+            (CameraFrameStage)InternalCalls.Rendering_ScriptableRenderContext_GetStage(
+                m_nativeHandle);
+
+        public bool RenderBuiltinForwardMainScene()
+        {
+            return InternalCalls
+                .Rendering_ScriptableRenderContext_RenderBuiltinForwardMainScene(
+                    m_nativeHandle);
+        }
+    }
+}