Create Gaussian Distribution

## Why its important to make this change
Once the abstraction of replacing the RNG with a Distribution object has been completed, there should be an implementation of Gaussian give that its a standard function.

## How much time I would invest in making this patch (if I had the free time to do it)
3 hours

Start by locating the Distribution abstraction and any existing random-number or distribution implementations in the Java library. Confirm how the completed RNG replacement is intended to be used, then define done as a Gaussian distribution implementation that follows the project's existing conventions and standard Gaussian behavior.

Written by the indexing model from the issue text.