Regression and Classification Set + Recommended Loading Scripts

What's Changed

Release Notes: https://srlearn.github.io/relational-datasets/changelog/#v040-2022-11-03

• ✨ Bump datasets to v0.0.6, Add california_housing and roofworld20 by @hayesall in #28
• 🚧 Bump codecov-action to v3 by @hayesall in #29
• ✨ Dataset loading recommendations by @hayesall in #30
• 🔧 Set pythonpublish.yml to use pypi-publish by @hayesall in #31
• 📝 Add changelog entry for v0.4.0 by @hayesall in #32

Full Changelog: v0.3.0...v0.4.0