Adds NLU predictions to DialogueStateTracker.
Creates component (see parent class for full docstring).
Adds NLU predictions to the tracker.
predictions- A list of NLU predictions wrapped as Messages
tracker- The tracker the predictions should be attached to
domain- The domain of the model.
original_message- An original message from the user with extra metadata to annotate the predictions (e.g. channel)
The original tracker updated with events created from the predictions