[JIT] Add a phase to perform inplace<->functional conversion for activation operators (#57477)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57477
Currently the conversion only deals with activation operators. The legality check is somewhat strict for now.
Test Plan:
```
python test/test_jit.py -k test_functional_to_inplace_activation
python test/test_jit.py -k test_inplace_to_functional_activation
```
Reviewed By: mrshenli
Differential Revision: D28155153
Pulled By: desertfire
fbshipit-source-id: df092830c4dff3ce9578ff76285eb7a566b7d81b
