[Pytorch Numeric Suite] Add module level comparison (#37242)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37242
Add module level comparison API.
ghstack-source-id: 102853727
Test Plan: buck test mode/dev caffe2/test:quantization -- 'test_compare_model_stub'
Reviewed By: raghuramank100
Differential Revision: D21232277
fbshipit-source-id: de707eea101a66a37869129460274c56e4e07db2
