Rename IterableAsDataPipe to IterableWrapper (#63981)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63981
Rename `IterableAsDataPipe` to `IterableWrapper` based on our naming convention `Op-er`
Test Plan: Imported from OSS
Reviewed By: VitalyFedyunin
Differential Revision: D30554197
Pulled By: ejguan
fbshipit-source-id: c2eacb20df5645d83ca165d6a1591f7e4791990f
