iolog: add version 3 to support timestamp-based replay

iolog: add version 3 to support timestamp-based replay

Version 3 format looks as follows:

    timestamp filename action offset length

All file and IO actions must have timestamps, including 'add'. The 'wait'
action is not allowed with version 3 so that we can leave all timing
functionality to timestamps.

Signed-off-by: Mohamad Gebai <mogeb@fb.com>
Link: https://lore.kernel.org/r/20220407174031.599117-2-mogeb@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>