Nodes: Swap Node Operator

Implement a native method to swap between different node and zone types.

This implementation repurposes the existing menu definitions as base
classes, from which both an "Add" and a "Swap" version would be generated
from. This allows both menus to have the same layout, but use their own
operators for handling the different node/zone types.

In this PR, support for all node editors has been implemented.

Invoking the menu is currently bound to `Shift + S`, same as the old
implementation in Node Wrangler. Since "Swap" is implemented as a
regular menu, features that menus already have such as type-to-search
and adding to Quick Favorites don't require any extra caveats to
consider.

Resolves #133452

Pull Request: https://projects.blender.org/blender/blender/pulls/143997

scripts/presets/keyconfig/keymap_data/blender_default.py

@@ -2231,6 +2231,7 @@ def km_node_editor(params):
         ("node.link_make", {"type": 'J', "value": 'PRESS', "shift": True},
          {"properties": [("replace", True)]}),
         op_menu("NODE_MT_add", {"type": 'A', "value": 'PRESS', "shift": True}),
+        op_menu("NODE_MT_swap", {"type": 'S', "value": 'PRESS', "shift": True}),
         ("node.duplicate_move", {"type": 'D', "value": 'PRESS', "shift": True},
          {"properties": [("NODE_OT_translate_attach", [("TRANSFORM_OT_translate", [("view2d_edge_pan", True)])])]}),
         ("node.duplicate_move_linked", {"type": 'D', "value": 'PRESS', "alt": True},