[quant][graphmode][fx] Add graph mode quantization on fx (#43175)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43175
This PR added graph mode quantization on fx: https://github.com/pytorch/pytorch/pull/42741
Currently it matches eager mode quantization for torchvision with static/dynamic/qat
ddp/synbn test is still wip
Test Plan:
python test/test_quantization.py TestQuantizeFx
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D23178602
fbshipit-source-id: 8e7e0322846fbda2cfa79ad188abd7235326f879
