Curves: initial brush system integration for curves sculpt mode

This adds the boilerplate code that is necessary to use the tool/brush/paint
systems in the new sculpt curves mode.

Two temporary dummy tools are part of this patch. They do nothing and
only serve to test the boilerplate. When the first actual tool is added,
those dummy tools will be removed.

Differential Revision: https://developer.blender.org/D14117

release/scripts/startup/bl_ui/space_toolsystem_toolbar.py

@@ -2306,6 +2306,19 @@ class _defs_gpencil_weight:
         )
 
 
+class _defs_curves_sculpt:
+
+    @staticmethod
+    def generate_from_brushes(context):
+        return generate_from_enum_ex(
+            context,
+            idname_prefix="builtin_brush.",
+            icon_prefix="ops.curves.sculpt_",
+            type= bpy.types.Brush,
+            attr="curves_sculpt_tool",
+        )
+
+
 class _defs_gpencil_vertex:
 
     @staticmethod
@@ -3065,6 +3078,9 @@ class VIEW3D_PT_tools_active(ToolSelectPanelHelper, Panel):
                 else ()
             ),
         ],
+        'SCULPT_CURVES': [
+            _defs_curves_sculpt.generate_from_brushes,
+        ],
     }