adding IterableDataset to dataset.pyi (#27966)
Summary:
this shall fix https://github.com/pytorch/pytorch/issues/27820
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27966
Differential Revision: D17929633
Pulled By: ezyang
fbshipit-source-id: ff3e0fb7f998b0771183288200c0859eb5f381dd
