[FEATURE] Let class schema detect multiple property types

Extbase creates class schema objects for classes to gather
information for further analysis. One part of that information
is property types. In recent TYPO3 and PHP versions, extbase did
expect a property to have zero or one type.

Due to changes to PHP (Union Types/Intersection Types), extbase's
internal behaviour needs to change and detect all declared types.

This is especially useful in models whose properties can now be
declared as

public Entity|LazyLoadingProxy|null $reference = null;

Releases: main
Resolves: #98132
Change-Id: I36dd8fd3d152e8dbf0443a5a1866c444d6fecbd0
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75417


Tested-by: Stefan Froemken <froemken@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Stefan Froemken <froemken@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: core...