default void init() throws IOException {
        // This method left intentionally blank.
    }
Lifecycle method to perform any one-time initialization of the retriever. This must
be performed by the caller to ensure the correct state before methods are invoked.

@throws IOException Thrown on errors related to IO during initialization
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/Initable.java