Other plots like box/violin/pdf/kde plots

[87sam12]

Is your feature request related to a problem? Please describe.
I felt like it would be great if the charting designs like box/violin/PDF(Probability Density Function)/KDE(Kernel Density Estimation) be added to this already awesome library.

Describe the solution you'd like
Each of those plots helps in viewing the data in a slightly different manner such that it can highlight different aspects of the dataset.

Describe alternatives you've considered
I have seen many alternatives. But I find this library's design to be more appealing and attractive. So I felt that these additions would take this library to a whole new level. These are very common generic designs which are provided by many libraries out there. It would be great to see them here as well.

[maurochiozzi]

+1 (supporting #849 too)

I tried some visual alternatives using Swarm, just like #849. The lack of information in this first moment is not an issue, but I would love to see statistic charts as a final solution from this package.

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