[FEAT]: rolling median

[dberardo-com]

I don't know if this is needed overall in the project, but i believe a rolling median could be an interesting add on to the stats package: https://www.sitmo.com/efficient-rolling-median-with-the-two-heaps-algorithm-olog-n/

[MaxHalford]

Hey @dberardo-com! There's already stats.Quantile, so you can do a rolling median with stats.Quantile(0.5) 👍