Added OpInfo gradcheck_wrapper to replace output_func (#54914)
Summary:
Added a field to `OpInfo` to provide a wrapper function for gradcheck. This is useful for functions that need to perform some extra input/output processing to work with gradcheck.
fixes https://github.com/pytorch/pytorch/issues/50837
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54914
Reviewed By: H-Huang
Differential Revision: D27435234
Pulled By: heitorschueroff
fbshipit-source-id: fa3e9b61f3d3df221243fd142ddb8b7861dbf669
