Added pathlib support to datasets/utils.py

[ahmadsharif1]

This is clone of PR https://github.com/pytorch/vision/pull/8200. I am redoing this because PR 8200 was rebased instead of merged and added spurious authors in the log.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8214

• :page_facing_up: Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

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

As of commit 09119e316514cc5efdcb6a6abb35998934c88792 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.

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[NicolasHug]

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