Add Dialogue Policy

[kbalog]

next_intent() goes here

[WerLaj]

@NoB0 @kbalog We could have a separate class DialoguePolicy that implements the next_dialogue_act() method that predicts the next dialogue act given the last user utterance and dialogue_history. This method is used in receive_utterance() in the agent to generate the agent's response. We probably want to predict the next dialogue act not only the intent, as intent annotations may be needed for generating the agent's response.

[kbalog]

@WerLaj Yes to creating a new DialoguePolicyclass. I suppose in most cases we'd want to predict next dialogue act, but that'll likely involve next intent prediction as a first substep.