Improve rendering of curves

[abidlabs]

Fixes the smooth curve rendering and also small performance improvements when there are many plots.

Fixes: #461

Before: https://huggingface.co/spaces/qgallouedec/trackio-0.20
After: https://huggingface.co/spaces/abidlabs/trackio-on-spaces-420082

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
trackio	patch

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• Improve rendering of curves

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[gradio-pr-bot]

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[HuggingFaceDocBuilderDev]

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[abidlabs]

Thanks @qgallouedec!