tsk-54: Tweak instant message endpoint to save contact and message identification (#56)

Closes #54

Reviewed-on: phoenix/textsender-api#56
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/handler/instant_message.go

@@ -110,6 +110,9 @@ func (s *SendInstantMessageHandler) Send(w http.ResponseWriter, r *http.Request)
 										mer.Response = data
 										mer.UserId = req.UserId
 										mer.Sent = parsedTime
+										mer.Status = message.Message_Event_Response_Status_Instant
+										mer.ContactId = c.Id
+										mer.MessageId = &msg.Id
 										if err := s.MERStore.Create(ctx, &mer); err != nil {
 											statusCode = http.StatusInternalServerError
 											resp.Message = err.Error()