feat: handler resolver

[pi0]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR exposes a new app.resolve(path) method that can be used to resolve an even handler matching path (method unspecified/get for now).

This API is useful to access handlers for new APIs such as WebSocket or accessing handler meta.

Resolver is async to allow lazy methods.

App, Nested App, Lazy handlers and Router are supported and tested.

📝 Checklist

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

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