[quant][graphmode][fx] Move qat_swap_modules outside of Quantizer (#58454)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58454
Trying to remove Quantizer in the end
Test Plan:
python test/test_quantization.py TestQuantizeFx
python test/test_quantization.py TestQuantizeFxOps
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D28497966
fbshipit-source-id: 800f8e4afd99918d7330345f8ae7bcf018a5bde7
