Update type annotations to include `pathlib.Path`

[joshestein]

Addresses https://github.com/pytorch/vision/issues/2962.

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[NicolasHug]

Thanks for the PR @joshestein . Unfortunately we cannot add these type annotations because they would break torchscript support, which is a required feature of these functions. That being said, even if we can't add the type annotations, all of those already properly support Path inputs.