Define the type of a route

[labra]

Following @Vinnl_gitlab suggestion, a good way that apps can discover routes in solid pods is through the Type index registry. In order for that, it will be important to put special care on a type for routes.

Some questions:

• Is there any commonly accepted type?
• Otherwise, which one would be a good name? viade:Route ? Assuming we already have a viade namespace?