This follow other API pattern in Efl, specifically every iterator API in eina.
Depends on D9960
honestly, I don't know why selected_iterator_new should be exist as we have already fl.Ui.Multi_Selectable_Async.selected_items_get.
and if this name has to be changed like this,
I think we only need unselected_iterator_new
and efl.Ui.Multi_Selectable_Async.selected_items_get need to changed as selected_iterator_new?