Be able to drag up or down item lists

[ericheose]

For example, in a TODO list, I want to be able to prioritise tasks by dragging tasks up or down in a table list view similar to React.

[josemariagarcia95]

Yes, to add an "on_drag" and "on_drop" properties to Reflex to be able to add drag-and-drop features to the apps would be neat.