feat: added expandAll function to CollapsibleTree to handle expansion of all nested nodes

[bjoaquinc]

📝 Summary

Created a expandAll function to handle expansion of all nodes including nested children inside a column. Partially resolves #4163 by adding a way to expand all nested collapsed nodes

🔍 Description of Changes

• Created expandAll() function in id-tree.tsx
• Created a test for expandAll() in id-tree.test.ts to ensure that it expands nested collapsed nodes properly

📋 Checklist

• [x] I have read the contributor guidelines.
• [x] 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).
• [x] I have added tests for the changes made.
• [x] I have run the code and verified that it works as expected.

📜 Reviewers

@mscolnick

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Name	Status	Preview	Comments	Updated (UTC)
marimo-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 1, 2025 3:39pm

[mscolnick]

i tried to make a simplification but realized it was wrong, so I reverted my change. this looks good!

[github-actions[bot]]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.13.4-dev11