[quant] Remove unused quantize handler definitions (#83360)
Summary:
CommonQuantizeHandler This was added previously to make some of the refactor to use reference quantized model flow easier, now we have
fully migrated to use reference quantized model flow, it's no longer needed, so we can remove it
Also updated some comments
Test Plan:
python test/test_quantization.py TestQuantizeFx
python test/test_quantization.py TestQuantizeFxOps
python test/test_quantization.py TestQuantizeFxModels
Reviewers:
Subscribers:
Tasks:
Tags:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/83360
Approved by: https://github.com/andrewor14
