[special] Add special.ndtri (#58650)
Summary:
Reference: https://github.com/pytorch/pytorch/issues/50345
TODO
* [x] Add docs https://13865352-65600975-gh.circle-artifacts.com/0/docs/special.html#torch.special.ndtri
* [x] Add comments on implementation
* [x] Clean-up
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58650
Reviewed By: H-Huang
Differential Revision: D29160170
Pulled By: mruberry
fbshipit-source-id: 50e4ea663920e97b8437d03d5b52bcd9dedc1a8d
