Add geometric and harmonic means

[Kucharssim]

fixes https://github.com/jasp-stats/INTERNAL-jasp/issues/2203

[vandenman]

The code looks good. I still need to run it inside JASP.

[JohnnyDoorn]

I like the option to have these choices, but one thing I worry about a bit is that now 99% of the users might be confused about which option to choose when they want "the mean". I am also not so well-versed in the different types of means, so can definitely sympathize. Would it be an option to keep calling the arithmetic mean "mean", so indicate that this is the "default" mean? Just like in R, where calling mean() just gives the one type. Then in the infofield (which now also shows up as tooltip), we call it arithmetic mean to specify the type of mean? I think that would keep the interface more userfriendly, while giving the option to users to also calculate different types of means. Anyway just a thought and curious to hear your opinion on this!

[EJWagenmakers]

Is there a screenshot of what that looks now?

[Kucharssim]

Currently this PR implements it like so (the arithmetic mean is selected by default)

I am not opposed to do it differently if there is a concensus on that

[EJWagenmakers]

And we have a tooltip on the the different kinds of means? So the alternative, @JohnnyDoorn, is to have "Mean" underneath "Median", and have this be the arithmetic mean; then the two additions need to be somewhere below. But how would this look, exactly?

[Kucharssim]

The help files (and tooltips) do not say much atm, I could add the formulas to make the definitions clearer?

[Kucharssim]

For example, I could add this to the arithmetic mean tooltip