Feature: Api to toggle typing status on a conversation (#807)

- api to toggle typing status on a conversation
- clients receive webhook events on the same

Addresses: #718 , #719 , #775

config/routes.rb

@@ -49,6 +49,7 @@ Rails.application.routes.draw do
           end
           member do
             post :toggle_status
+            post :toggle_typing_status
             post :update_last_seen
           end
         end