[TASK] Deprecate methods in ReflectionService

As the ReflectionService class is only a wrapper to call
methods on ClassSchema instances, all wrapper methods
should be deprecated and removed to make space for
a new, superior api.

Releases: master
Resolves: #85004
Change-Id: I7daabe1ab09c1c8a95b2b6dad2227c8859929dc0
Reviewed-on: https://review.typo3.org/56896


Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>