[TASK] Extract preset logic into separate class in EXT:impexp

Move the preset logic into a separate PresetRepository to
improve readability of ImportExportController.

Change-Id: If93196e8766f6891dd510a4d79ffc0f1a8e00de3
Resolves: #72700
Releases: master
Reviewed-on: https://review.typo3.org/45885


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>