Add Mypy and Coverage.py

[areibman]

🚀 Feature Request

💡 Got a brilliant idea? Currently, our test coverage is not being tracked. Also, we want to abide by Mypy typing

🤔 Is your feature request related to a problem? We don't have adequate coverage reporting.

🎉 Describe the solution you'd like Add mypy and coverage.py to our tox file.

[dot-agi]

Working on this in this PR #153

[siyangqiu]

Merged. Thanks @the-praxs