cryptsetup: convert to the new option and verb parsers

cryptsetup: convert to the new option and verb parsers

The synopisis is moved from the header to the a new section:

  -systemd-cryptsetup attach VOLUME SOURCE-DEVICE [KEY-FILE] [CONFIG]
  -systemd-cryptsetup detach VOLUME
  +systemd-cryptsetup [OPTIONS...] {COMMAND} ...

   Attach or detach an encrypted block device.

  +Commands:
  +  attach VOLUME SOURCE-DEVICE [KEY-FILE] [CONFIG] Attach an encrypted block
  +                                                  device
  +  detach VOLUME                                   Detach an encrypted block
  +                                                  device
  +
  +Options:

I think that's OK… With the autogenerated table that's the natural
thing to do.

Co-developed-by: Claude Opus 4.6 <noreply@anthropic.com>