Adds a demo to show how a sound alert can be played when a prediction is complete

[abidlabs]

Adds a demo (sound_alert.py) to show how a sound alert can be played when a prediction is complete.

CLoses: #2173

[abidlabs]

Just removes some unused imports I noticed

[github-actions]

All the demos for this PR have been deployed at https://huggingface.co/spaces/gradio-pr-deploys/pr-2478-all-demos

[aliabd]

Nice @abidlabs

I'm seeing a console error on the demo, even though it runs as expected

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'forEach')
    at $ (index.b57b8f62.js:55:2384)

Also, consider adding the demo to the docstrings where applicable (maybe at blocks?) or to the demos page. Otherwise LGTM

[abidlabs]

Thanks for the review @aliabd! Will address these

[freddyaboulton]

Looks good to me @abidlabs!

[dawoodkhan82]

works for me. nice demo!

[abidlabs]

Thanks for the review folks! @aliabd I believe the JS error is happening because this event trigger doesn't have any inputs or outputs. Gonna leave that for a future PR but I've gone ahead and added this demo the Blocks class.