public Optional<String> getAuthorizer(ToShapeId service) {
        return getAuthorizer(service, service);
    }
Gets the effective authorizer name of a service.

@param service Service shape to query.
@return Returns the optionally resolved authorizer name.
smithy-aws-apigateway-traits/src/main/java/software/amazon/smithy/aws/apigateway/traits/AuthorizerIndex.java