[PyTorch Numeric Suite] Add weight compare API (#36186)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36186
Start PyTorch Numeric Suite under PyTorch quantization and add weight compare API to it.
ghstack-source-id: 102062165
Test Plan: buck test mode/dev caffe2/test:quantization -- 'test_compare_weights'
Differential Revision: D20903395
fbshipit-source-id: 125d84569837142626a0e2119b3b7657a32dbf4e
