Added
* Added `sim_tools.distribution` module. This contains classes representing popular sampling distributions for Discrete-event simulation. All classes encapsulate a `numpy.random.Generator` object, a random seed, and the parameters of a sampling distribution.
Changed
* Python has been updated, tested, and patched for 3.10 and 3.11 as well as numpy 1.20+
* Minor linting and code formatting improvement.