fix: add vega-datasets package to framework examples

[RaulPL]

📝 Summary

When running the frameworks examples, the app fails to execute the dataframe.py because of vega-datasets missing dependency. This PR adds the vega-datasets package to each main.py script of the frameworks examples.

🔍 Description of Changes

Add the vega-datasets package to each main.py script of the frameworks examples

📋 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)
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[github-actions]

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[RaulPL]

I have read the CLA Document and I hereby sign the CLA

[mscolnick]

thank you!

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.10.13-dev3