Arm backend: Add experimental support for new TOSAQuantizer

[AdrianLundell]

Allows initializing TOSA/EthosU/Vgf quantizers with use_composable_quantizer=True to use a new implementation of the quantizer following the Cortex-M. See
#17701 for more details.

• Creates a new temporary TOSAQuantizer API layer for switching between the two versions
• Adds a TOSAQuantizationConfig encapturing TOSA-specific qspec requirements for certain ops.
• Adds quantizer_support.py for defining what operators are supported by the quantizer.
• Align mark_node_as_annotated in cortex-m backend to TOSAQuantizer behaviour.
• Update quantizer reporter to handle TOSA qspecs as they are dynamically created.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18100

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 2 New Failures

As of commit 5c02aa7 with merge base 096f10c ():

NEW FAILURES - The following jobs have failed:

• trunk / test-multimodal-macos (gemma3-4b) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / unittest-release / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_linear_model

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

[zingo]

Hi @SS-JIA / @digantdesai this adds a file, do you want/need to check this?
This is also something we would like to get into 1.2 is possible.

[AdrianLundell]

Fails unrelated