[CLEANUP] Add class-imports in Extbase Persistence classes

This cleanup should ease backporting future patches in that area.

Releases: master, 8.7, 7.6
Resolves: #83189
Change-Id: I42b700d2fd17beadc4a9b8e64e500f3d3b93fd1f
Reviewed-on: https://review.typo3.org/54896


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>