Have FileDumperOutput print the ID of event being printed
It would be useful to have
FileDumperOutput optionally print the ID of the event being dumped.
While this information is available from normal art messages, these messages are not customisable and they contain timestamps.
This makes harder to compare the output of two different dump jobs.
With this option enabled and proper redirection as in issue #18152, running on the same input file should allow to create completely identical dump files, but still allow for an immediate identification of which event is printed.