Support Authentication Inheritance

**Is your feature request related to a problem? Please describe.**
When having a collection, the authentication is often the same for all requests in that collection. Sometimes some requests in some folder require different authentication. For both use-cases, inherited authentication would fit.

**Describe the solution you'd like**
- A backend that supports authentication with this priority (basically finding the first auth when going upwards from a request in the collection tree):
1. Request
2. Folder
3. Collection
- A UI that supports setting authentication on any folder or collection. The actual auth component already exists and can be reused directly. Only the menu for it is missing
- Having a new authentication option on folders and requests: `"Inherit"`

**Describe alternatives you've considered**

**Additional context**

Review linked pull request #779 first, since it is already addressing this feature. Compare its changes with the requested request, folder, and collection authentication priority, the reusable authentication UI, and the new "Inherit" option; done means those behaviors are covered across backend and UI.

Written by the indexing model from the issue text.