Feature: Typing Indicator on widget and dashboard (#811)

* Adds typing indicator for widget
* typing indicator for agents in dashboard

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/controllers/api/v1/widget/conversations_controller.rb

@@ -0,0 +1,27 @@
+class Api::V1::Widget::ConversationsController < Api::V1::Widget::BaseController
+  include Events::Types
+  before_action :set_web_widget
+  before_action :set_contact
+
+  def toggle_typing
+    head :ok if conversation.nil?
+
+    if permitted_params[:typing_status] == 'on'
+      trigger_typing_event(CONVERSATION_TYPING_ON)
+    elsif permitted_params[:typing_status] == 'off'
+      trigger_typing_event(CONVERSATION_TYPING_OFF)
+    end
+
+    head :ok
+  end
+
+  private
+
+  def trigger_typing_event(event)
+    Rails.configuration.dispatcher.dispatch(event, Time.zone.now, conversation: conversation, user: @contact)
+  end
+
+  def permitted_params
+    params.permit(:id, :typing_status, :website_token)
+  end
+end