MLBEDSW-8290: MLCE: Add TRANSPOSE support

 - Added graph optimiser function to convert TRANSPOSE op
into an AvgPool op with swapped stride for height and width
 - Added TRANSPOSE supported op check
 - Added unit tests for TRANSPOSE supported op check
 - Updated SUPPORTED_OPS.md
 - Fixed problem in pass packing when optimizing the pass list.
Old problem, but now seen when moving TRANSPOSE from cpu.

Change-Id: I0a0ef420b0fb8241090c2e2434622881105cde15
Signed-off-by: Johan Alfven <johan.alfven@arm.com>