[FEATURE] Add metadata to filebrowser search

Now also searching for metadata in the filebrowser is possible.
The corresponding files are then listed.

Resolves: #71644
Releases: master
Change-Id: Ibea04dfb716496247ded3c22e9fd326cce5427d8
Reviewed-on: https://review.typo3.org/56891


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Elena Bartolotti <bartolotti.elena@gmail.com>
Tested-by: Elena Bartolotti <bartolotti.elena@gmail.com>
Tested-by: Cristian Buja <cristian.buja@intera.it>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>