public static Relationship create(Shape shape, RelationshipType relationshipType, Shape neighborShape) {
        return new Relationship(shape, relationshipType, neighborShape.getId(), neighborShape);
    }
Constructs a valid shape relationship where the neighbor is present.

@param shape The shape the relationship originates from.
@param relationshipType The relationshipType of relationship.
@param neighborShape The shape the relationship targets.
@return Returns the created Relationship.
smithy-model/src/main/java/software/amazon/smithy/model/neighbor/Relationship.java