Merge develop into edit-config-pr (#8)

* Add Build Matrix for CI (CrayLabs#130)

Adds various dimensions to the CI build matrix
for SmartSim. The build matrix now uses MacOS
& Ubuntu, GNU8, RedisAI 1.2.3 & 1.2.5, and
Python 3.7-3.9. The build matrix excludes building
with RedisAI 1.2.5 when on MacOS as RedisAI
temporarily removed support for MacOS in 1.2.4
and 1.2.5

[ committed by @EricGustin and @Spartee ]
[ reviewed by @Spartee ]

* Remove numpy as a dependency (CrayLabs#132)

* Remove np from step.py and requirements

Create a helper function called get_base_36_repr so that we can remove numpy from step.py

Remove numpy from requirements.txt

Pin requirements.dev to a specific version of numpy

* Remove numpy from requirements

* Remove numpy from setup

[ committed by @EricGustin ]
[ reviewed by @Spartee ]