Curves: Add radius transform mode to edit mode

This adds the radius control operator and active tool
to curves edit mode.

Pull Request: https://projects.blender.org/blender/blender/pulls/114017

scripts/presets/keyconfig/keymap_data/blender_default.py

@@ -6078,6 +6078,8 @@ def km_edit_curves(params):
         ("curves.select_less", {"type": 'NUMPAD_MINUS', "value": 'PRESS', "ctrl": True, "repeat": True}, None),
         *_template_items_proportional_editing(
             params, connected=True, toggle_data_path='tool_settings.use_proportional_edit'),
+        ("transform.transform", {"type": 'S', "value": 'PRESS', "alt": True},
+         {"properties": [("mode", 'CURVE_SHRINKFATTEN')]}),
     ])
 
     return keymap