[BUGFIX] ArrayConverter can now convert all types of strings

The ArrayConverter has been extended to be able to handle more
string formats. Previously, it was only able to handle empty strings.

Resolves: #88389
Releases: master
Change-Id: I418072cdb32118cfe4e81ff01930cabbc86fee16
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61410


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Haupt <mail@danielhaupt.de>
Tested-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Reviewed-by: Daniel Haupt <mail@danielhaupt.de>
Reviewed-by: Alexander Schnitzler <git@alexanderschnitzler.de>