Add draggable list

[KristinAoki]

Improvements

There is increased usage of the frontend-lib-content-components DraggableList. Currently the components is used on Custom Pages in the course authoring MFE and games block editor. Other people outside of the TNL team are interested in using component. It would be great to make it more general. The current component is an adaptation from dnd kit's Sortable list with drag handles.