improvement: Extract and lift inline script metadata in marimo convert

[manzt]

📝 Summary

Adds support for extracting inline script metadata from notebook cells, and lifting the comment block to the top of the converted marimo Python script.

This allows for nice interchange between a tool like juv and marimo:

juv init
juv add Untitled.ipynb anywidget polars
marimo convert Untitled.ipynb > Untitled.py
marimo edit Untitled.py

🔍 Description of Changes

Adds regex to extract metadata from inline script comments, and lifts the comment block to the top of the converted marimo Python script.

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

📜 Reviewers

@akshayka OR @mscolnick

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
marimo-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 12, 2024 4:45pm
marimo-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 12, 2024 4:45pm

[mscolnick]

thank you!

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.9.18-dev19