Add a `gr.Draggable` layout (#11742)
* initial
* add changeset
* works
* changes
* changes
* changes
* rm files
* notebooks
* changes
* format
* draggable
* format
* draggable
* simplify
* changes
* fix review
* rename demo
* handle form components
* draggable
* remove drag previow
* changes
* draggable
* change
* changes
* format
* changes
* fix lockfile
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Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: pngwn <hello@pngwn.io>
