Playground requirements tab (#9460)
* Add a tab navigation to the playground so the user can specify the requirement packages
* Add Transformers.js.py demo and fix the playground to install the requirements immediately after switching the demo
* add changeset
* Format
* add changeset
* Fix preview flex
* Add requirements to the share link and deploy to Spaces buttons
* Add requirements.txt to each demo
* Format
* Update notebooks
* Fix
* Update
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Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: aliabd <ali.si3luwa@gmail.com>
