[quant][eagermode] Custom module support (#44835)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44835
This is for feature parity with fx graph mode quantization
Test Plan: Imported from OSS
Reviewed By: z-a-f
Differential Revision: D23745086
fbshipit-source-id: ae2fc86129f9896d5a9039b73006a4da15821307
