MLBEDSW-7689: Document verbose command stream options

 - Documented High-Level and register-Level command stream options
 - Changed High-Level command stream display to show the name of the
command
 - Fixed an issue with some operators not being displayed by the
CLI option --verbose-operators
 - Changed an unneeded print in pass packing to a more useful assertion

Change-Id: I9d53f19f4e32d0478209bc964724c27c935f66d6
Signed-off-by: Tim Hall <tim.hall@arm.com>