Use ServiceReference.adaptTo(ServiceReferenceDTO)

ServiceComponentRuntimeImpl currently maintains a cache per bundle (updated by bundle and service listeners) to have a performant way to create ServiceReferenceDTOs
Since OSGi R8 , ServiceReference now supports adapting directly to a ServiceReferenceDTO which would avoid the whole cache.
Downside is that we tie the implementation to R8 - I think this is fine for the R8 implementation of DS

tjwatson What do you think?