[quant][gx][graphmode][refactor] Remove modules from Quantizer (#59030)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59030
Trying to remove Quantizer class and split prepare and convert code
Test Plan:
python test/test_quantization.py TestQuantizeFx
python test/test_quantization.py TestQuantizeFxOps
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D28724875
fbshipit-source-id: d6610c1d5eb7755331252be9e348a230abf4175c
