private String claimOrHeaderJsonText(String claimName, String claimValue) {
        return QUOTE + escape(claimName) + QUOTE + ":" + QUOTE + escape(claimValue) + QUOTE;
    }
Add and validate all the configured extensions.
 Token keys, apart from passing regex validation, must not be equal to the reserved key {@link OAuthBearerClientInitialResponse#AUTH_KEY}
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/unsecured/OAuthBearerUnsecuredLoginCallbackHandler.java