[Feature Request] Module Restructuring Part 1 about fsharp.stats

[bvenn]

@DoganCK, could you please also update the references in the documentation (e.g. here).

You can render the documentation by yourself using dotnet fsdocs watch --eval.

[DoganCK]

All the affected docs should be fixed now.

Adding parameters proved to be more complicated than anticipated. For instance, MultiVariateNormal distribution has differently typed parameters (i.e. vector and matrix) and Hypergeometric has integer and float parameters which bars us from using a Map as envisioned. This requires more thinking. This is also something we can discuss when we discuss the abstraction of distributions. So I struck that out for now.