Arm backend: Move QuantArgs to its own file in _passes/

[Sebastian-Larsson]

The is part of an effort to reduce the number of functions/classes in utility files. This class has no reason being in a utility file when it has a clear purpose on its own.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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❌ 1 New Failure, 2 Unrelated Failures

As of commit 0a40ceb with merge base 90ff059 ():

NEW FAILURE - The following job has failed:

• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t a36ec7ce8b5b018f37d9a228755025e92d794860473cdec67cae0016d4d2350c /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'
• trunk / test-models-arm-zephyr (add) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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