feat: make to_html deterministic

[Skn0tt]

Closes #3449

This PR makes to_html deterministic. It does so by using a static ID for the HTML div that the plots are rendered into, as opposed to a random UUID that changes on every run.
This is useful when HTML reports are tracked using tools like DVC, where a difference in checksum is used as an indicator for content change.

Code PR

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[nicolaskruchten]

Thanks for this PR! Unfortunately, I won't be able to accept it as-is, as it might break things for folks who are using this function to generate HTML fragments for multiple figures, and then injecting them into the same downstream HTML file.

I would recommend adding a new argument to the end of the argument list like div_id with a default value of None (which would preserve the current behaviour) and if it's a string, then that string would be used in place of the UUID.

[Skn0tt]

Hi Nicolas, thanks for getting back so fast! That makes a lot of sense, didn't think of usecases where multiple HTML outputs are in the same file. Implemented in 3b461a7.

[nicolaskruchten]

Thanks!