Boxplot: Set Whisker options

Problem: Boxplot Whiskers can map to different data – sometimes this is +- 1.5 times the interquartil range, sometime the 5th and 95th percentile etc. In the box documentation, it is state that plotly uses the +-1.5 IQR as a standard. It is also stated that the boxpoints option allows other options, but seemingly boxpoints sets the displaying sof catterpoint and not of whiskers.

Proposed Solution: An option for setting what the whiskers mean. Candidates for this option would:

• n * IQR (for a +-1.5* the IQR, like the current default)
• nth percentiles (for something like a 5%/95% position)
• n*sd (for a +- 1 standard deviation position)

Or, if that option(s) already exists, a hint in the docuementation on how to set them.

Start with the boxplot documentation linked in the issue and inspect how the existing boxpoints option is described. Determine whether whisker behavior is already configurable or whether a new option is needed, then define and document the supported IQR, percentile, or standard-deviation behavior. Done means the chosen whisker settings work and the boxplot documentation explains how to use them.