fstrim: Pretty-print the trimmed size in addition to showing raw byte counts.

Also do not bother printing sizes if we are exiting without success
and nothing was reported as trimmed.

Extend the functionality of bin/fstrim

Improvements:
* Introduce new command-line parameters for the offset and length
of the trimmed region
* Introduce a new command-line parameter that must be specified
in order to trim a block/character device instead of a file system
* By default, warn users that trim can potentially destroy data
* Display the number of bytes trimmed even if the ioctl returns
an error

Change-Id: I9eec535abe74f7ef09c927292a120016f4156684
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4154
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

bin/fstrim: Fix format strings through B_PRI macros

trim: Target SCSI UNMAP command instead of WRITE SAME.

* The UNMAP command is theoretically much faster, as it can get many block
ranges instead of just a single range.
* Furthermore, the ATA TRIM command resembles it much better.
* Therefore, fs_trim_data now gets an array of ranges, and we use SCSI UNMAP
to trim.
* Updated BFS code to collect array ranges to fully support the new
fs_trim_data possibilities.

Added fstrim command.

Later, there should be a service that runs this from time to time for all
devices that support it.

Conflicts:
build/jam/HaikuImage

bin/fstrim: Fix format strings through B_PRI macros

trim: Target SCSI UNMAP command instead of WRITE SAME.

* The UNMAP command is theoretically much faster, as it can get many block
ranges instead of just a single range.
* Furthermore, the ATA TRIM command resembles it much better.
* Therefore, fs_trim_data now gets an array of ranges, and we use SCSI UNMAP
to trim.
* Updated BFS code to collect array ranges to fully support the new
fs_trim_data possibilities.

Added fstrim command.

Later, there should be a service that runs this from time to time for all
devices that support it.

Conflicts:
build/jam/HaikuImage