Please add a Python API for moving shape key block

In Blender 5, drag-and-drop and batch reordering have been added to the shape key UI. However, these operations are implemented internally and are not accessible from Python. Therefore, add-ons still have to rely on bpy.ops.object.shape_key_move() , which becomes very slow when reordering multiple keys.

Providing a direct API for moving shape key blocks would greatly improve performance and usability for add-on developers.