Fetch existing relationship types

To get a relationship type object from the repository, use RAMSession.getAllRelationshipTypes() or RAMSession.getRelationshipType(String name).

                //Fetch all relationship types
                RAMRelationshipType[] relationshipTypes = session.getAllRelationshipTypes();
                
                //Fetch a relationship type by name
                RAMRelationshipType relationshipType = session.getRelationshipType("myRelType");
                
                //Fetch a relationship type by Display Name
                relationshipType = session.getRelationshipType("My Relationship Type");

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