@Override
        public int hashCode() {
            return Objects.hash(configs, moduleOptions);
        }
<code>VkrKey</code> is a simple structure which encapsulates the criteria for different
sets of configuration. This will allow us to use this object as a key in a {@link Map}
to keep a single instance per key.
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/OAuthBearerValidatorCallbackHandler.java