Google Source: Append surveyResponse as message

[steffh]

Is your feature request related to a problem? Please describe.

As an Airy API user having enabled channels of type google,
I want to be able to receive a surveyResponse that end users give in the form of ratings,
as messages appended to the relevant conversation

Describe the solution you'd like

Event Payload received by Google:

{
  "agent": "brands/BRAND_ID/agents/AGENT_ID",
  "sendTime": "SEND_TIME",
  "conversationId": "CONVERSATION_ID",
  "requestId": "REQUEST_ID",
  "surveyResponse": {
    "survey": "conversations/CONVERSATION_ID/surveys/SURVEY_ID",
    "rating": "SURVEY_RATING",
    "createTime": "CREATE_TIME",
    "surveyQuestionId": "QUESTION_ID",
    "questionResponseText": "RESPONSE_TEXT",
    "questionResponsePostbackData": "RESPONSE_POSTBACK_DATA",
    "questionType": "QUESTION_TYPE",
    "questionIndex": QUESTION_INDEX,
    "totalQuestionCount": TOTAL_QUESTION_COUNT,
    "surveyTriggerSource": "TRIGGER_SOURCE"
  }
}

Source: https://developers.google.com/business-communications/business-messages/guides/build/surveys?method=console#receive

Should be appended as an additional message to the conversation as such:

{
  "type": "message",
  "payload": {
    "conversation_id": "{UUID}",
    "channel_id": "{UUID}",
    "message": {
      "id": "{UUID}",
      "content": {
         "agent": "brands/BRAND_ID/agents/AGENT_ID",
         "sendTime": "SEND_TIME",
         "conversationId": "CONVERSATION_ID",
         "requestId": "REQUEST_ID",
         "surveyResponse": { OBJECT_FROM_EVENT }
      },
      "delivery_state": "pending|failed|delivered",
      // delivery state of message, one of pending, failed, delivered
      "from_contact": true,
      "sent_at": "{string}",
      "source": "google"
    }
  }
}

Describe alternatives you've considered

Additional context