pytorch

935057fc - [package] turn MockZipReader into DirectoryReader and add test coverage (#59107)

[package] turn MockZipReader into DirectoryReader and add test coverage (#59107) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/59107 Adding documentation, test coverage, and a missing method to the `DirectoryReader` class. `DirectoryReader` was previously named `MockZipReader`, and is used for operating on opened package archives via a `PackageImporter`. Test Plan: Imported from OSS Reviewed By: SplitInfinity Differential Revision: D28760410 Pulled By: Lilyjjo fbshipit-source-id: aa9d0a68e19738a6d5555bb04ce33af6a53f1268