Alias for `i0` to `special` namespace (#59141)
Summary:
See https://github.com/pytorch/pytorch/issues/50345
cc: mruberry kshitij12345
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59141
Reviewed By: ngimel
Differential Revision: D28784097
Pulled By: mruberry
fbshipit-source-id: 9b61a21906ef337292686fd40e328502a79e6f09
