Add mode to TarArchiveReader (#63332)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63332
Add a corresponding PR from [torchdata](https://github.com/facebookexternal/torchdata/pull/101)
Test Plan: Imported from OSS
Reviewed By: astaff
Differential Revision: D30350151
Pulled By: ejguan
fbshipit-source-id: bced4a1ee1ce89d4e91e678327342e1c095dbb9e
