KafkaChannel buildChannel(String id, TransportLayer transportLayer, Supplier<Authenticator> authenticatorCreator,
                              int maxReceiveSize, MemoryPool memoryPool, ChannelMetadataRegistry metadataRegistry) {
        return new KafkaChannel(id, transportLayer, authenticatorCreator, maxReceiveSize, memoryPool, metadataRegistry);
    }
Constructs a plaintext channel builder. ListenerName is non-null whenever
it's instantiated in the broker and null otherwise.
clients/src/main/java/org/apache/kafka/common/network/PlaintextChannelBuilder.java