[TASK] Display content_date in sys_file_metadata TCA

Display content_creation_date and content_modification_date of images,
audio files and videos in the TCA of sys_file_metadata records.

Resolves: #76267
Releases: master, 7.6
Change-Id: I77dd1b35f5ba7e1f4dbd975ad1ad339e8a0ada6e
Reviewed-on: https://review.typo3.org/48243


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>