Rich Response Group can include Default responses

[dariowho]

AS A Language Designer
I WANT TO include 'default' responses in 'rich' response group
SO THAT I save time and reduce chance of errors when defining Language resources

Details

This can be done by adding a new "include" response type:

responses:
  default:
    ...
  rich:
    - include: default
    - text:
      ...

Test scenarios

• Default responses are included

  GIVEN Intent travels.user_ask_train_station has at least a text response in "default"
  AND it has "include: default" in "rich"
  THEN  exported agent will show Default responses in rich platform responses
  

• Invalid reference (e.g. include: asdasd) raises ValuError

  GIVEN a test intent exists with at least a text response in "default" 
  AND it has "include: asdasd" in "rich"
  THEN  ValueError is thrown when loading intent language
  

• Including "rich" in "default" raises ValueError

  GIVEN a test intent exists with both "default" and "rich" groups defined
  AND it has "include: default" in "rich"
  THEN  ValueError is thrown when loading intent language
  

• Including "default" with no reponses produces a Warning log

  GIVEN a test intent exists with no responses in the "default" group 
  AND it has "include: default" in the "rich" group
  THEN exported agent will have no extra answers in rich platform responses
  AND a warning log is produced when loading intent language resources