Allow nonbinding producer methods to have scopes

Currently, you cannot have a nonbinding producer method, e.g. one where the annotation is read at runtime, with a scope. This means that repeated injections always happen. It would be better if you could scope the nonbinding producer methods, so that the results were bound, e.g. to a request scope, so that look ups can be done once.

The current way to avoid this is to use a holder object with the proper scope.