Added pathlib support to datasets/utils.py

[ahmadsharif1]

This is a clone of #8200 . Cloned because that PR's author list was polluted by a git rebase and contained spurious authors.

[pytorch-bot[bot]]

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8215

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:white_check_mark: You can merge normally! (1 Unrelated Failure)

As of commit 1eb72e019a164c5c5c830b2131d8e78b750b2995 with merge base a00a72b1ee41483407717379fb5cafe992de2f82 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Lint / bc (gh) Process completed with exit code 1.

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[NicolasHug]

This was addressed by https://github.com/pytorch/vision/pull/8200, closing