[FEATURE] Migrationwizard for files to FAL

Migrate:
* relation media
* relatedFiles

Resolves: #60449

Change-Id: I65b3431f9c27cd16ba66156670dafdf67764ee80
Reviewed-on: https://review.typo3.org/31662
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>