fix(nuxt3)!: include route children in parent suspense

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This wraps the suspense for child routes into it's parent, which means page:finish is now accurate (it means all route components have been fully resolved). However, it's a breaking change in that the hook is now only called once, with the top-level route component.

👉 Migration

The page:start and page:finish hooks are now only called once, with the top-level route component rather than any nested route components.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[pi0]

@danielroe Would you mind updating breaking change tracker?