ns for fx: enable `call_method` nodes in graph matching (#56194)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56194
Enables the NS graph matcher to also match `call_method` nodes.
These are useful for ops such as `torch.sigmoid`.
Test Plan:
```
python test/test_quantization.py TestFXGraphMatcher.test_methods
```
Imported from OSS
Reviewed By: jerryzh168
Differential Revision: D27805333
fbshipit-source-id: 509ae283db6b245671f11e3eb6b7fcb3a5735ef5
