Use BatchRenameJob to rename multiple files in Dolphin

Summary:
Use KIO::BatchRenameJob in Dolphin::RenameDialog to rename multiple files.
With this viewing progress of rename operation and undo is possible.

See D9103 and D9107.

Reviewers: #dolphin, elvisangelaccio

Subscribers: elvisangelaccio, ngraham, broulik

Differential Revision: https://phabricator.kde.org/D9836