Poetry for Dependency Management and TestContainers for Integration Testing

[bsbodden]

In this PR:

• Uses Poetry for Dependency Management
• Replaces the Makefile with Python scripts that can be run from Poetry
• Implements TestContainers with a Docker Compose file for integration testing

[bsbodden]

@tylerhutcherson Test will likely fail in CI since we would need to configure Github Actions correctly to use TestContainers. I will look into that soon.

But please test locally and see if it all works for you!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.43%. Comparing base (5fad799) to head (923272b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #134 +/- ## ======================================= Coverage 88.43% 88.43% ======================================= Files 26 26 Lines 1565 1565 ======================================= Hits 1384 1384 Misses 181 181 ```

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