Allow customzing the trackio color palette

[abidlabs]

And also updates the default color palette away from the harsh red/blue/green:

to a warmer muave, amber, blue

Short description

This PR... [fill here]

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• I used AI to add the env variable and cli commands after updating the default the color pallette myself. Reviewed all code
• I did not use AI

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Type of Change

• Bug fix
• New feature (non-breaking)
• New feature (breaking change)
• Documentation update
• Test improvements

Related Issues

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[gradio-pr-bot]

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•	Name	Status	URL
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[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
trackio	minor

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• Allow customzing the trackio color palette

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✅ Changeset approved by @abidlabs

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[qgallouedec]

Idea for future: support named palette, like "pastel", "rainbow" etc

[abidlabs]

Yep sounds good!