Refactor project

[mcdonnnj]

💡 Summary

This project should be refactored for multiple reasons.

Motivation and context

An AWS Lambda just needs to be a single deployable artifact that only needs to support a single Lambda runtime. Given that premise we can pare down the Docker/pipenv configuration to target a single version of Python (corresponding with a supported AWS Lambda Python runtime). This should also allow us to integrate testing of the Python code much more easily.

Implementation notes

• Reduce the pipenv configurations down to a single configuration targeting a single Python version.
• Reorganize the directory structure accordingly.
• Implement support for Python code testing (through pytest).
• Update the GitHub Actions workflows accordingly.

Acceptance criteria

• There is only a single deployment artifact created.
• Python code testing is integrated.