[ao] Added Quantization QConfig generation to ModelReport class (#83688)
Summary: This adds the capability to generate a QConfigMapping based on
the suggestions of the ModelReport API for the user to use. The only
dependency of this feature is that the callibration is run before the
generation of the QConfigMapping and there is no dependency on the
report generation other than that the observers cannot be removed before
this is called.
Example Usage (after callibration):
```
mapping = mod_report.generate_qconfig_mapping()
prepared_model = quantize_fx.prepare_fx(model, mapping, example_input)
quantized_model = quantize_fx.convert_fx(prepared)
```
This was tested by ensuring that the suggestions generated in the
QConfigMapping are:
1. Correct according to the set backend and data passed through
2. Able to be prepared and converted as a proper config (is a valid
config)
The test for this is a part of the TestFxModelReportClass test suite.
Test Plan: python test/test_quantization.py TestFxModelReportClass.test_qconfig_mapping_generation
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Pull Request resolved: https://github.com/pytorch/pytorch/pull/83688
Approved by: https://github.com/jerryzh168
