Cortex-M backend: Introduce QuantizerReporter

[AdrianLundell]

The QuantizerReporter logs how a graph is annotated.

Basic useage:

1. Implement the QuantizerReporterUser API for all quantizers intending to use the reporter.
2. Instantiate the QuantizerReporter with a list of quantizers to be reported.
3. After annotation, log the report using QuantizerReporter.log_quantizer_report(model).

Logs a summary report at INFO level, and a detailed node-per-node report at DEBUG level. See the added test for example output.

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

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❌ 1 Awaiting Approval, 5 New Failures, 1 Unrelated Failure

As of commit 6b856f6 with merge base 03f066a ():

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• periodic (gh)

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• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t cb3ebdc26b7f3497cd88352fda768d9728feac0688e67be1d6dc205fa76bb1b6 /exec failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 33d61e6f7b0f7fe164e66213083b42b500a2b4876507e58e0f95e464264b55b7 /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 9277bb0be1e1fc46643d8413dbf8c438baae17130071bf111172c9a055ce23eb /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t dcdd312d8225e798b8750c871bc9356c376dc999f37d4ec68741c76149ab2d64 /exec failed with exit code 1

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

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

• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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