Add statistics module

[DjSapsan]

Please, add module with statistics and distributions

[shakesoda]

that's too vague of a request, do you have anything more specific?

[mcclure]

If I search "lua statistics" on google I find at least two existing libraries for stats.

However, maybe there are things we could do to support integration with eg our vector types with one or more of those libraries, I don't know?

[DjSapsan]

I meant something like numpy. Functions for statistic and distribution:
https://numpy.org/doc/stable/reference/routines.statistics.html