KERML — Add a property for Annotations owned by an AnnotatingElement

When parsing the notation for AnnotatingElements that explicitly identify their annotatedElements, the corresponding Annotation relationships are owned by the AnnotatingElement. It would be convenient to have a property that subsets AnnotatingElement::annotation and Element::ownedRelationship that could directly hold these. Note that this cannot be called ownedAnnotations, because AnnotatingElement already inherits a property with that name from Element, which is for Annotations owned by annotated Elements, not AnnotatingElements. Perhaps the new property on AnnotatingElement could be called ownedAnnotatingRelationship.