@Override
    public String toString() {
        return String.format("EmbeddedConnectStandalone(numBrokers= %d, workerProps= %s)",
            numBrokers,
            workerProps);
    }
Start a standalone embedded connect worker. Internally, this class will spin up a Kafka cluster,
set up any tmp directories. and clean them up on exit. Methods on the same
{@code EmbeddedConnectStandalone} are not guaranteed to be thread-safe.
connect/runtime/src/test/java/org/apache/kafka/connect/util/clusters/EmbeddedConnectStandalone.java