Arm backend: Support channels-last input and output

[pytorchbot]

• Insert transposes for input/output iff the incoming/outgoing data is
  in channels first format.
• For testing using tosa_reference_mode, transpose numpy arrays to and
  from correct data format since numpy doesn't have the concept of
  dim_order.
• Remove checks for channels_first only input.
• Remove check for not changing dim_order before to_tosa_memory_format
  pass since the behaviour of channel last tensors is non-predictable.
• Add dim order testing of example networks and mv2
• Add a section to the documentation about memory formats.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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❌ 1 New Failure

As of commit cb348ae with merge base e0dda90 ():

NEW FAILURE - The following job has failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t bb58cb03de5b8685bd4483d9b4009335e906228016a94dafba87ae86c2edd5a6 /exec failed with exit code 1

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[GregoryComer]

Re-running jobs with infra failures. If it looks good, I'll merge shortly.

[GregoryComer]

Samsung failure is unrelated infra. Discussed offline and it's being investigated. Merging.