Re-export Q_ANNOTATION_KEY from quantizer annotators package

[manuelcandales]

Summary:
D95244673 refactored annotators.py into a package annotators/ but
left __init__.py empty, breaking downstream imports of
Q_ANNOTATION_KEY from executorch.backends.qualcomm.quantizer.annotators.

This fixes type-checking failures.

Reviewed By: Gasoonjia

Differential Revision: D95862010

[pytorch-bot]

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❌ 3 New Failures, 1 Pending, 1 Unrelated Failure

As of commit 7b6883e with merge base 7b5c60d ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t df44f85b84ade80758b2afb5fa6002dc5d46fa7079aa928b8ef2be2a25e4a1cf /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t e65a58448ac80f201d1f343ba10f86d8918b96b900ef393aad4504d89facd947 /exec failed with exit code 1
• pull / test-sqnr-static-llm-qnn-linux (smollm2_135m) / linux-job (gh)
  RuntimeError: Command docker exec -t 9bddacc99f8b2b8d3f8be3d32ba1e1439accc595807acaaeb8118a13358980d4 /exec failed with exit code 56

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Test CUDA Builds / test-models-cuda (add_mul) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[Copilot]

Pull request overview

This PR aims to address breakages caused by refactoring Qualcomm quantizer annotators into a package, and updates example code to import quantization types/helpers from their new locations.

Changes:

• Update fastvit.py to import QuantizationConfig from qconfig and QuantizationSpec directly from torchao.
• Update custom_ops_1.py to import _is_annotated from executorch.backends.qualcomm.quantizer.rules instead of ...quantizer.annotators.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
examples/qualcomm/oss_scripts/fastvit.py	Adjusts quantization-related imports to match the post-refactor module layout.
examples/qualcomm/custom_op/custom_ops_1.py	Fixes the import path for _is_annotated used by the custom-op annotation example.

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[Copilot]

PR title/description indicate restoring downstream import of Q_ANNOTATION_KEY from executorch.backends.qualcomm.quantizer.annotators, but that package’s annotators/__init__.py is still empty in this change set, so downstream imports will still fail. Please re-export Q_ANNOTATION_KEY (and ideally include it in __all__) from backends/qualcomm/quantizer/annotators/__init__.py to actually fix the reported type-checking break.