feat: db pull implementation

[svetch]

Summary

This PR introduces db pull support to zenstack_v3, similar to Prisma’s db pull.
The command enables introspection of the database schema and generates corresponding models within the project.

Current Status

• ✅ Initial implementation of db pull command
• ✅ Relation resolving logic
• 📝 Implement diff update on db pull
• 📝 improve logging
• 📝 Need to determine the best approach for testing

Next Steps

• Finalize relation resolution in introspection results
• Add automated tests?

Notes

• I appreciate any feedback, suggestions, or requests for changes 🙏

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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