[payno]

PR summary

This PR is a follow up of #4762

Especially the 'BTW, it's probably better to hide the X and Y labels of the histograms, nobody will ever need them.' part.

Showing / hidding histograms is a per use case question. And Breaking existing doesn't seems the best solution.
Nevertheless users should be able to tune the histograms easily.

So this PR add an API to retrieve the histogram and let user control over them.

AI Disclosure

• Claude Opus 5.5 used

[kklmn]

Let me clarify my words "it's probably better to hide the X and Y labels of the histograms, nobody will ever need them".
I was talking about the "X" label of the vertical histogram and the "Y" label of the horizontal histogram (note again, not the main binning axes of the histograms!). They have units "counts per bin", not any physical units.
And yes, nobody displays labels and units on those axes.