There will need to be two things pieces for each resolver:

1. Some DSL model object that defines the configuration for a particular plugin repository.
2. A resolver service implementation that does the work of resolving plugins from that repository.

The build author does stuff with the DSL object, which is then later converted into a service implementation when we need the result.

The DSL object can extend Named, but should not have a resolve() method. The resolver service can have a resolve() method, but should not extend Named.

So, given that this interface later turns into the service interface, let's get rid of Named from here.