[quant][graphmode][fx][refactor] Remove patterns from Quantizer class (#59033)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59033
To remove Quantizer class and split prepare and convert functions to different files
Test Plan:
python test/test_quantization.py TestQuantizeFx
python test/test_quantization.py TestQuantizeFxOps
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D28724861
fbshipit-source-id: 97b38e851b6bf581510a24636b1d8d6f1d977f5a
