code: public static PactDslJsonRootValue stringType() {
      PactDslJsonRootValue value = new PactDslJsonRootValue();
      value.generators.addGenerator(Category.BODY, "", new RandomStringGenerator(20));
      value.setValue("string");
      value.setMatcher(TypeMatcher.INSTANCE);
      return value;
    }
docs: Value that can be any string