Change build system to hatchling; added a test workflow

[swryan]

Summary

• added a rudimentary test workflow
• replaced setup.py with pyproject.toml using the hatchling build system
• add setuptools as a dependency because test.py uses distutils.spawn
• renamed test directory to tests and added an __init__.py so it could be tested as a sub-package
• added fail messages to tests that are expected to be skipped

Related Issues

• Resolves #

Backwards incompatibilities

None

New Dependencies

None