Support "Deletion Time" role in Trash

This allows to sort by and show (both as additional data in icon view and column in column
view) deletion date of files in Trash.

CHANGELOG: It is now possible to view and sort by "Deletion Time" in Trash

BUG: 153492
FIXED-IN: 17.08.0

Differential Revision: https://phabricator.kde.org/D6269