Model3D panning, improved UX

[dylanebert]

Improvements to the Model3D component

• Enabled panning
• Adapt pan and zoom speed to scene radius, creating a consistent experience across various model sizes
• Set lower radius limit to prevent zoom inversion (zooming in below 0)

Closes: #6119

[gradio-pr-bot]

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[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/model3d	minor
gradio	minor

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With the following changelog entry.

Model3D panning, improved UX

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[abidlabs]

LGTM tested on mobile as well. This:

Set lower radius limit to prevent zoom inversion (zooming in below 0)

is really nice, thanks @dylanebert!