[quant][graphmode][fx] Fork subgraph_rewriter from torch.fx to quantization (#68228)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68228
Forking this for now so that we can make changes as we need, the changes can be merged back to torch.fx
later
Test Plan:
```
python test/test_quantization.py TestQuantizeFx
python test/test_quantization.py TestQuantizeFxOps
```
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D32537713
fbshipit-source-id: 326598d13645fcc28ef2c66baaac6a077b80fd0c
