[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.

Inizia dal percorso di conversione JSON dell'oggetto Figure e riproduci il caso segnalato con json loads, confrontando l'output delle versioni 6.0.1 e 5.24.1. Traccia il motivo per cui l'array y diventa bdata e definisci il completamento come un modo ovvio per accedere agli array sottostanti originali senza codifica base64.