[JIT] Test __getstate__ and __setstate__ for custom bound C++ classes
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/32470
Test Plan: Imported from OSS
Differential Revision: D19508250
Pulled By: jamesr66a
fbshipit-source-id: 481299fb3c18fa874c2a1d2993984bb6b3193bac
