Add ebitengine game of life example

[rokostik]

This PR adds an ebitengine game of life example. It runs very slow and I think it could be useful to use as a benchmark for optimizations.

Also added two new built in functions random-integer and change\\nth! needed for the example.

Depends on changes in https://github.com/refaktor/rye-contrib/pull/2

[refaktor]

Great! I can't wait to review it ... this is an unusual problem for Rye, so it will be good in improving it for more imperative problems. And I was already thinking yes that adding a game engine will add pressure to be more aware of speed implications. So yes, it will be a good general benchmark! :)