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Summary:
`extra_archive` in `datasets.utils` does not distinguish the input type, and blindly treats it as tar, then zip in case of failure.

This is an anti-pattern. All the dataset implementations know which archive type the downloaded files are.

This commit splits extract_archive function into dedicated functions, and make each dataset use the correct one.

Pull Request resolved: https://github.com/pytorch/audio/pull/2927

Reviewed By: carolineechen

Differential Revision: D42154069

Pulled By: mthrok

fbshipit-source-id: bc46cc2af26aa086ef49aa1f9a94b6dedb55f85e