feat(nuxt)!: support universal global middleware

[danielroe]

🔗 Linked issue

resolves nuxt/nuxt#13888, closes #4795

❓ 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 support for global middleware in the universal router - ie. even if the user doesn't have a pages/ directory. Note that only global middleware is supported so middleware must have a .global.ts suffix for it to be applied on route navigation. (This is for consistency.)

👉 Migration

• If you are using pages:middleware:extend hook, then you can switch to using app:resolve, where you will be able to access app.middleware.

📝 Checklist

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

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[atinux]

Looks good to me ❤️ , would be nice to add a test for.

[pi0]

As discussed with @danielroe remaining changes:

• Use an array format for middleware (supporting nameless middleware and consistency)
• Add an alternative hook to extend route middleware. (postponed)

[danielroe]

@pi0 Let me know when you plan to review this and I will resolve conflicts.

[pi0]

@danielroe You can rebase. I think we are close to merge :)