@Override
  public <StreamMessageType> GenericInputDescriptor<StreamMessageType> getInputDescriptor(
      String streamId, Serde<StreamMessageType> serde) {
    return new GenericInputDescriptor<>(streamId, this, serde);
  }
Constructs and {@link DelegatingSystemDescriptor} instance with given transformer and no system
level Serde. Serdes are to be provided at stream level when getting input/output descriptors.
@param systemName
@param transformer
samza-core/src/main/java/org/apache/samza/system/descriptors/DelegatingSystemDescriptor.java