efl: make Efl.Ui.Factory.release work in batches.

This will enable better strategy in scheduling removal of object from the cache
instead of doing the throttling in the View as there is a better understanding
of the different layer the items are going to go through and where they will
consume time.

Reviewed-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Differential Revision: https://phab.enlightenment.org/D9955