We already have support for this header for a single Basic / Bearer credential as can be found in https://github.com/plabayo/rama/blob/main/rama-http/src/layer/auth/require_authorization.rs.

Goal of this issue is to:

• provide also support for [Basic; N], Vec<Basic>, [Bearer; N] and Vec<Bearer>;
• but also to support Arc<...> support

In order to support this all it is probably easiest to refactor the code a bit by:

• providing a "sealed" (private) trait "Authorizer" which is implemented for Basic, Bearer, Vec<impl Authorizer>, [impl Authorizer; N], Arc<Authorizer>.

This way you only need a single implementation of the actual authorize/anonymouse logic as the actual authorization validation can be done by the Authorizer trait.

This issue is low priority, but due to a contribution from someone recently I noticed that we don't have support for multiple credentials here yet, while we do have that support for Proxy-Authorization. Mentorship is available for this one.