Other changes:

- Remove optional test dependencies in favor of hatch environments
- Remove optional dependencies already defined by pre-commit
- Remove bumpversion and twine in favor of hatch
- Set dynamic __version__ handled by hatch
- Update CI to use hatch
- Add Aaron Zuspan as second author
- Update developer guide

`hatch shell` doesn't seem to work in a Github action. Instead, it
should work to use `hatch run` to run the sourcery login in the dev
environment and let the pre-commit action handle installation of
pre-commit.

See pypa/hatch#845. This was necessary because our project name
is different from our package name, so hatch wasn't able to
locate it in the default path. Note that if the shell has been
built before making this change, it will need to be manually
rebuilt by running `hatch env prune`.