text: Title: Implement distutils.strtobool to remove dependency on distutils
  Body: Getting the following deprecation warning on 3.10:
  ```
  ../../.pyenv/versions/3.10.2/envs/graphql-db-api/lib/python3.10/site-packages/shillelagh/fields.py:5
    /Users/alex/.pyenv/versions/3.10.2/envs/graphql-db-api/lib/python3.10/site-packages/shillelagh/fields.py:5: DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives
      from distutils.util import strtobool
  
  -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
  ```