@Override
        public String toString() {
            return stringValue;
        }
Converts to a schema that uses "patternProperties". If a map's key
member or its target does not have a {@code pattern} trait, a default
indicating one or more of any character (".+") is applied.
smithy-jsonschema/src/main/java/software/amazon/smithy/jsonschema/JsonSchemaConfig.java