Narwhals v0.9.17

Changes

• Enh: extend narwhalify (#328)

✨ Enhancements

• feat: support Date dtype in Narwhals (#341)

📖 Documentation

• doc: added decorator (#334)
• docs: Update documentation for group_by (#332)

🛠️ Other improvements

• refactor: Refactor and reorganise tests (#336)
• refactor: rename series_from_iterable (#335)

Thank you to all our contributors for making this release possible!
@DeaMariaLeon, @EdAbati, @FBruzzesi, @MarcoGorelli and @marenwestermann