Compositor: Combine and Separate XYZ Node

We have this node for shader and geometry nodes. Compositor can also
work with vectors, and this can help with that.

Reviewed By: manzanilla

Maniphest Tasks: T95385

Differential Revision: https://developer.blender.org/D12919

release/scripts/startup/nodeitems_builtins.py

@@ -547,6 +547,8 @@ compositor_node_categories = [
         NodeItem("CompositorNodeCombYUVA"),
         NodeItem("CompositorNodeSepYCCA"),
         NodeItem("CompositorNodeCombYCCA"),
+        NodeItem("CompositorNodeSeparateXYZ"),
+        NodeItem("CompositorNodeCombineXYZ"),
         NodeItem("CompositorNodeSwitchView"),
         NodeItem("CompositorNodeConvertColorSpace"),
     ]),