[torch.special] Add special.erf{c, inv} (#53260)
Summary:
Reference: https://github.com/pytorch/pytorch/issues/50345
Also adds `overrides` entry for module and the newly added functions.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53260
Reviewed By: agolynski
Differential Revision: D27114342
Pulled By: mruberry
fbshipit-source-id: b1dd88f373db251bb71df12d33b160382138f63f
