test: add pyproject.toml: set pytest and ruff project defaults Pytest 6 is required to use this. This means it works only for python3. It includes a dummy setting for redis password assuming redis is running at the default port. This requires pytest-env be installed. At some point I expect to add project and build-system tables to allow building using the build package. The version and long_description specifiers in the project table will be dynamic since the version is from roundup/__init__.py and description from doc/announcement.txt. One open issue is how to support the equivalent of: python setup.py build_doc to run sphinx over the docs and include them in the share directory bundled with the distributions. Modified test_redis_session.py to better handle empty password.