scsi: scsi_debug: Maintain write statistics per group number

Track per GROUP NUMBER how many write commands have been processed. Make
this information available in sysfs. Reset these statistics if any data
is written into the sysfs attribute.

Note: SCSI devices should only interpret the information in the GROUP
NUMBER field as a stream identifier if the ST_ENBLE bit has been set to
one. This patch follows a simpler approach: count the number of writes
per GROUP NUMBER whether or not the group number represents a stream
identifier.

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240130214911.1863909-20-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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