Geometry Nodes: Separate Components Node

Implementation of T86970. This node takes a geometry input with
multiple components and outputs them by component type. Meshes,
Curves, and Point Clouds support combining multiple input instances,
while volumes will only output the first volume component input until
suitable instance realization for multiple volumes is finished.

When direct geometry instancing is implemented it will be possible to
avoid realizing instances in this node.

Differential Revision: https://developer.blender.org/D11577

release/scripts/startup/nodeitems_builtins.py

@@ -514,6 +514,7 @@ geometry_node_categories = [
         NodeItem("GeometryNodeDeleteGeometry"),
         NodeItem("GeometryNodeTransform"),
         NodeItem("GeometryNodeJoinGeometry"),
+        NodeItem("GeometryNodeSeparateComponents"),
     ]),
     GeometryNodeCategory("GEO_INPUT", "Input", items=[
         NodeItem("GeometryNodeObjectInfo"),