feat: add parameter to histogramQuantile

[wolffcm]

Closes #5385.

This adds a parameter to histogramQuantile that will let the user decide upon an alternative behavior when bin counts are not monotonically increasing. Currently only "error" is supported in this PR, I just wanted to get a bit of feedback before I do more.

As described in the Flux stdlib doc comments, this adds a parameter called onNonmonotonic that accepts three values:

• error (default)
• force
• drop

@sanderson Do you have any thoughts on this approach? My thinking is that we have a similar parameter for filter called onEmpty, so I'm kind of following that pattern.

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[sanderson]

@wolffcm This looks good to me. I notice force and drop as other potential options in the source. Are these just placeholders?

[wolffcm]

I notice force and drop as other potential options in the source. Are these just placeholders?

Yes, that's right. They are unused, but I just wanted to indicate that they would be potential values.

[sanderson]

Yes, that's right. They are unused, but I just wanted to indicate that they would be potential values.

Sounds good. Just wanted to make sure.