Add Math.random

[hovsater]

I was not sure if we were missing Math.random or if there is valid reason to why we're not supporting it yet. Feel free to close this pull request with an explanation if that's the case. 🙂

[Namek]

Personally, I would be after a Random module that would support deterministic results based on seeds. Of course, we need also the Math.random() to somehow produce a randomized seed but maybe better in the other module rather than Math. I would love to hear your inputs!

[gdotdesign]

I think Math.random have it's use cases and there is no reason why there cannot be a Random module that supports a seed.

Thanks for the PR 👍