[PyTorch Numeric Suite] Add module level comparison (#36669)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36669
Add module level comparison API.
ghstack-source-id: 102802362
Test Plan: buck test mode/dev caffe2/test:quantization -- 'test_compare_model_stub'
Differential Revision: D21045393
fbshipit-source-id: 4303805f732cc8c8fc67ce40d9594b664507bf82
