[FEATURE]: Provide an obvious way to access underlying data arrays within a Figure object (rather than the base64-encoded versions)

Hi, I have some some code here, as below (edited to remove extra logs). I'm converting a plotly figure into json, and then loading it with json loads. You would expect that to preserve the original data.

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However, as you can see, the "y" data (which had previously been an array of large numbers) are wrongly converted into this "bdata" thing instead.

I was able to solve this and get the data in the format I wanted by going from 6.0.1 -> 5.24.1, which was the last stable build I was using. I think this is a pretty fundamental issue, so let me know if there's anything else I can share.

Commencez par le chemin de conversion JSON de l’objet Figure et reproduisez le cas signalé avec json loads, en comparant la sortie des versions 6.0.1 et 5.24.1. Suivez pourquoi le tableau y devient bdata et définissez l’achèvement comme un moyen évident d’accéder aux tableaux sous-jacents d’origine sans encodage base64.