[BUGFIX] Adapt IndexerService to new table structures

When introducing sys_file_metadata and rearranging FAL
to do so some parts of the IndexerService have been
forgotten.
The IndexerService is now adapted to not do SQL itself
anymore and to push the imagesizes to the metadata table.

Resolves: #52765
Releases: 6.2
Change-Id: I692bbf26e99639d9174ce02603f19955a16cc12e
Reviewed-on: https://review.typo3.org/24726
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter