public static AccessTokenRetriever create(Map<String, ?> configs, Map<String, Object> jaasConfig) {
        return create(configs, null, jaasConfig);
    }
Create an {@link AccessTokenRetriever} from the given SASL and JAAS configuration.

<b>Note</b>: the returned <code>AccessTokenRetriever</code> is <em>not</em> initialized
here and must be done by the caller prior to use.

@param configs    SASL configuration
@param jaasConfig JAAS configuration

@return Non-<code>null</code> {@link AccessTokenRetriever}
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/AccessTokenRetrieverFactory.java