[KJob] Add a new Unit, that doesn't distinguish between dirs and files

Authored by ahmadsamir on Jun 6 2020, 4:15 PM.

Description

[KJob] Add a new Unit, that doesn't distinguish between dirs and files

Add a new Unit, Items, that can be used with e.g. batch rename jobs,
where calculating the separate number of dirs and files would mean using
StatJob's, which would make the, usually fast, direct rename job slower
for so little gain; also in the common case, i.e. using Dolphin, that
info is most likely already visible in the status bar when the user
selects the dirs/files to be renamed.

CCBUG: 422098