ns for fx: add fqn to results, when present (#61377)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61377
Both the quantization tracer and the NS tracer record
`_node_name_to_scope`, which contains the mapping from
node name to FQN.
This PR adds the FQN information to the NS results, so that it is
more convenient for users to attribute a NS result to the corresponding
module in their model.
Test Plan:
```
python test/test_quantization.py TestFXNumericSuiteCoreAPIs.test_extract_weights_fqn
python test/test_quantization.py TestFXNumericSuiteCoreAPIs.test_match_activations_fqn
python test/test_quantization.py TestFXNumericSuiteCoreAPIs.test_shadow_activations_fqn
```
Imported from OSS
Reviewed By: jerryzh168
Differential Revision: D29600349
fbshipit-source-id: df489e03daff97dd380f59c83ffdc2b0012a0a53
