Added support for URLs for Video, Audio, and Image

[abidlabs]

Previously, you could only pass in local filepaths for the Video and Audio components. This PR adds support for URLs as well.

Furthermore, while Image supported URLs for default values, examples with URLs didn't work. So this PR also fixes that.

Fixes: #2254

[github-actions]

All the demos for this PR have been deployed at https://huggingface.co/spaces/gradio-pr-deploys/pr-2256-all-demos

[aliabd]

LGTM! Tested locally and works great :)

[abidlabs]

Thanks for the review @aliabd! Just updated one of the example demos (reverse audio) to include an example URL.

Once the CI tests pass, I'll merge it in

[freddyaboulton]

@abidlabs This doesn't work on spaces 😬

[abidlabs]

@freddyaboulton it's working in the demos for this PR? https://huggingface.co/spaces/gradio-pr-deploys/pr-2256-all-demos

[abidlabs]

Have you pulled in all of the changes from main into that branch?

[freddyaboulton]

@abidlabs Going to factory reboot the space to see if that fixes it. I think that branch had to have the latest changes from main right? Otherwise the reverse_audio wouldn't have the file URL introduced in this pr.

[abidlabs]

Oh it looks like the file is no longer accessible! They probably have a timeout

[abidlabs]

Ideally we would use a file we're hosting ourselves, but for now can you replace with this one: https://samplelib.com/lib/preview/mp3/sample-3s.mp3

[freddyaboulton]

@abidlabs Sounds good and thank you! Updated in this PR #2250.