[quant][graphmode][fx] Add support for add (#43331)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43331
Porting op tests from test_quantize_jit.py
Test Plan:
TestQuantizeFxOps
Imported from OSS
Reviewed By: raghuramank100
Differential Revision: D23243561
fbshipit-source-id: 5a6399d25cc881728cf298c77570ce2aaf3ca22e
