Map module options between Python and C++ in API parity test (#25784)
Summary:
`torch.nn` modules in Python save their kwarg options directly as module object attributes, while `torch::nn` modules in C++ save their options inside the `options` field of the module object. This PR tries to map between these two (by using the newly added `options_args` list to discover options arguments in Python module), to make sure options equivalence is properly checked.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25784
Differential Revision: D17238609
Pulled By: yf225
fbshipit-source-id: 2febd277ddcbe3ab458ac3feaaf93e4c94bb5b98
