[quant][refactor tests] Move TestModelNumerics to a separate file (#59000)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59000
These tests span both QAT and PTQ APIs so factor them out
Test Plan:
python test/test_quantization.py TestModelNumericsEager
Imported from OSS
Reviewed By: HDCharles
Differential Revision: D28713910
fbshipit-source-id: b2ad27cf59abb7cc0c4e4da705f8c9220410f8ad
