[TASK] Export binary data from sys_file records

Until now files from TCA type group internal_type
file or file_reference were included as binary data in
the export only. Include also the binary data from
sys_file records in a separate array.

Resolves: #55431
Releases: 6.2
Change-Id: I9a1b1f090705f6a42ff34f98ec95b62a3a79c9c1
Reviewed-on: https://review.typo3.org/27364
Reviewed-by: Bernhard Kraft
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring