feat: bulk actions to update conversation objects (#3934)

Added the endpoints for bulk updating conversation objects

Fixes: #3845 #3940 #3943

config/routes.rb

@@ -40,6 +40,7 @@ Rails.application.routes.draw do
             resource :contact_merge, only: [:create]
           end
 
+          resource :bulk_actions, only: [:create]
           resources :agents, only: [:index, :create, :update, :destroy]
           resources :agent_bots, only: [:index, :create, :show, :update, :destroy]