[TASK] Use class imports in Cache Frontend classes

Resolves: #63327
Releases: master
Change-Id: I1da33150b9aaa585a907148246f3eaf44c79eefc
Reviewed-on: http://review.typo3.org/34620
Reviewed-by: Stefan Froemken <froemken@gmail.com>
Tested-by: Stefan Froemken <froemken@gmail.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>