zbd: get max_active_zones limit value from zoned devices

zbd: get max_active_zones limit value from zoned devices

As a preparation to improve open zones accounting for devices with the
max_active_zones limit, get the limit from the devices. In same manner
as max_open_zones, call get_max_active_zones callback if the I/O engine
supports it. Add the new call back to the I/O engine API and bump up
FIO_IOOPS_VERSION. It is expected that io_uring and xnvme engines to
support the callback later. When the callback is not available, refer
max_active_zones sysfs attribute for block devices. When the limit value
is not available, use zero value which means no limit. Keep the obtained
limit value in the struct zoned_block_device_info.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Reviewed-by: Niklas Cassel <niklas.cassel@wdc.com>
Link: https://lore.kernel.org/r/20230719105756.553146-2-shinichiro.kawasaki@wdc.com
Signed-off-by: Vincent Fu <vincent.fu@samsung.com>