NXP backend: NXP backend: Add option to run test reference quantized in Python

[MartinPavella]

Summary

NXP tests run models delegated to Neutron using the NSYS simulator. To determine correct output, a reference model is run on the CPU. Before, there were 2 choices for the reference, either non-delegated .pte file running in c++, or the original non-quantized float32 PyTorch model running in Python. This PR adds a 3rd option (to run in quantized edge dialect in Python), as well as easy extension to 2 more options in the future.

Test plan

Unit-tests provided.

cc @robert-kalmar @JakeStevens @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17733

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❌ 2 New Failures

As of commit af07191 with merge base 8f527e1 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 225db7dd431ef0e553164b9aafb7cfb985437a2e5832b64f6d1136d0fb784926 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 371f55df3384618e1f6cfc11104f295021b9ce3bc23fcd6a95c67b1d3585b5e3 /exec failed with exit code 1

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[MartinPavella]

@roman-janik-nxp please review this PR. There was some error and my previous PR is corrupted. The changes here should be identical to what you have approved in the other PR.

[MartinPavella]

The corresponding Executorch Integration PR is here: https://bitbucket.sw.nxp.com/projects/AITEC/repos/executorch-integration/pull-requests/127/diff#test%2Fpython%2Ftests%2Ftest_mobilenet_v2.py

[roman-janik-nxp]

@roman-janik-nxp please review this PR. There was some error and my previous PR is corrupted. The changes here should be identical to what you have approved in the other PR.

Please rebase on recent main.

[MartinPavella]

The failing checks seem unrelated and the internal build is passing (https://bamboo3.sw.nxp.com/browse/MLTECE-EXIGH93-11). Merging