Optionally show additional statistics in console output

[PragTob]

an option for the console formatter like extended_statistics or something would be nice to show statistics that we already collect but don't print yet. As of now this would be:

• minimum
• maximum
• sample size

These values can be interesting for different reasons, e.g. what is the worst case performance here or on how many results is this based. I don't really want to add them to the standard console formatter as the output would probably get too wide.

The new/extra statistics should probably be displayed underneath the normal statistics in a smiliar fashion as the normal statistics, meaning in the same order and in a table like format that goes:

name - minimum - maximum - sample size

[h4cc]

A starting point for this would be here: https://github.com/PragTob/benchee/blob/master/lib/benchee/formatters/console.ex#L76

[narrowtux]

.

[lwalter]

@PragTob Mind if I pick this one up?

[PragTob]

@lwalter nah not at all :) I'd be happy about it 🎉 , feels bad that we calculate all those values but rarely show them!

There is also a new value that might fit into there quite well that we have now, which is the mode! Not sure yet if I want to turn them on or off by default, but that's just one line to change in Configuration so it'd be cool.

I aim to cut a release relatively soon, so depending on what happens it might have to wait out that release but should ship soon after or maybe it'll even make the release :)

As always, feel free to start with an early PR with questions and direction if you feel like it 👍