feat(pages): add validate hook for definePageMeta

[danielroe]

🔗 Linked issue

resolvesnuxt/nuxt#14024

❓ 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 adds validate() function in definePageMeta for easily specifying what valid route options are for a given page. It supports returning an object error format that will then determine the error response on SSR.

📝 Checklist

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

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[atinux]

Shall we add also a section after https://v3.nuxtjs.org/getting-started/routing#route-middleware called "Route Validation" and taking the similar content as https://deploy-preview-7870--nuxt3-docs.netlify.app/migration/component-options#validate ?

[danielroe]

Great idea!

[antfu]

That's awesome, thank you!