text: Title: Implement various output modules for go-bot
  Body: The go-bot defaults to template-based response generation (i.e. the model learns to respond with relevant templates) though both non-templated and non-natural-language (e.g. #1196 verbose intermediate calculations logs) output features seem relevant.
  
  There has been done some refactoring to allow such extensions of the go-bot (yet some ideas are to be finished).
  
  To implement some additional output modules **the contribution could implement the [NLG module interface](https://github.com/deepmipt/DeepPavlov/blob/master/deeppavlov/models/go_bot/nlg/nlg_manager_interface.py).** The contribution could require the further refactor of the main go-bot codebase, do not hesitate to start a discussion on such a case.