feat: Builder for creating Campaign conversations (#2192)

- Builder for creating Campaign conversations
- Widget endpoint to fetch the campaigns

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

@@ -2,7 +2,8 @@ class Api::V1::Widget::EventsController < Api::V1::Widget::BaseController
   include Events::Types
 
   def create
-    Rails.configuration.dispatcher.dispatch(permitted_params[:name], Time.zone.now, contact_inbox: @contact_inbox, event_info: event_info)
+    Rails.configuration.dispatcher.dispatch(permitted_params[:name], Time.zone.now, contact_inbox: @contact_inbox,
+                                                                                    event_info: permitted_params[:event_info].to_h.merge(event_info))
     head :no_content
   end
 
@@ -17,6 +18,6 @@ class Api::V1::Widget::EventsController < Api::V1::Widget::BaseController
   end
 
   def permitted_params
-    params.permit(:name, :website_token)
+    params.permit(:name, :website_token, event_info: {})
   end
 end