chore: switch to pdm

[mjspeck]

What does this PR do?

Fixes #155

Requirement/Documentation

• If there is a requirement document, please, share it here.

Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)

• Chore (refactoring code, technical debt, workflow improvements)
  - [ ] New feature (non-breaking change which adds functionality)
  - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
  - [ ] Tests (Unit/Integration/E2E or any other test)
  - [ ] This change requires a documentation update

Mandatory Tasks

• Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected. Make sure before submitting this PR you run tests with evaluate.py

Note

- Do not merge before merging #154 Rebased those changes so they're not in this branch

[mjspeck]

Just realized I should either update or remove run.sh and update the README for this. Will do that when I have a bit more time.

[mjspeck]

FYI:

WARNING: Unable to find a resolution because the following dependencies don't work on all Python versions in the range of the project's 
`requires-python`: >=3.8.
  python>=3.9 (from <Candidate google-generativeai@0.3.2 from https://pypi.org/simple/google-generativeai/>)
A possible solution is to change the value of `requires-python` in pyproject.toml to >=3.9.

[mjspeck]

@joshbickett after you commented about using setup.py to publish, I realized that it happens in your GitHub actions. I updated those with what I think is the appropriate workflow to publish with pdm. It should also test the package across multiple python versions (relevant because there's actually a dependency that doesn't work in 3.8 even though in the old GitHub actions you were using Python 3.8) and different OSes (which should prevent future problems like #162).