Add the "Robust peak detection algorithm (using z-scores)" from SO.

[hv10]

Hi dear Maintainers,

thanks again for the great package - as I have profited from it greatly I wanted to give something back - by adding a new Algorithm.

I have been using the algorithm from the merge request myself quite a bit.
It is able to do peak detection in univariate real-time timeseries.
AFAIK the algorithm has been made public under attribution.

The source would be:

Brakel, J.P.G. van (2014). "Robust peak detection algorithm using z-scores". Stack Overflow. Available at: https://stackoverflow.com/questions/22583391/peak-signal-detection-in-realtime-timeseries-data/22640362#22640362 (version: 2020-11-08).

I am currently in the process of extending it (multivariate use case) - and would likely be able and willing to add the extensions as well, as I see this package as a great fit for these algorithms.

Let me know what I would need to do to make this fit both in spirit and in line with code standards of your package.

~hv10

EDIT: The algorithm(s) are also online and take constant memory.