[quant][graphmode][fx] custom_module support static/dynamic/weight_only quant (#46786)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46786
Previously we only support static quant, this PR added support for other types of quantization.
Note qat is actually orthogonal to these quant types, this is referring to the convert step where we
convert the observed module to a quantized module.
for qat, user will provide a CustomModule -> FakeQuantizedCustomModule in prepare_custom_config_dict
and FakeQuantizedCustomModule -> static/dynamic/weight_only quantized CustomModule in convert_custom_config_dict.
Test Plan: Imported from OSS
Reviewed By: raghuramank100
Differential Revision: D24514701
fbshipit-source-id: 2918be422dd76093d67a6df560aaaf949b7f338c
