ns_eager: rename Logger I/O var names to logger_cls (#51359)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51359
`Logger` is the name of the base Logger class. It's confusing that
it is also used as a variable name, which can represent this class
or its subclasses. Renaming to `logger_cls` to make it clearer.
Test Plan:
```
python test/test_quantization.py TestEagerModeNumericSuite
```
Imported from OSS
Reviewed By: supriyar
Differential Revision: D26149577
fbshipit-source-id: a9c12f9446f66e5c683ab054b2a94aeb0cf9cc8a
