ns for fx: make unshadowed activation comparison work for N models (#52357)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52357
Refactor the NS for FX compare unshadowed activations API to be able
to work on N models and do arbitrary matching strategies.
We factor out a util which takes a model and a list of
nodes to extract weights for, with names to give the extracted
weights. The user can then call this util with a set
of nodes and names created in any way they want.
Test Plan:
```
python test/test_quantization.py TestFXNumericSuiteCoreAPIs
```
Imported from OSS
Reviewed By: raghuramank100
Differential Revision: D26487270
fbshipit-source-id: 1372ef07b5f3ddc7cebdfb2dee0221a2facd0527
