feat: Builder for creating Campaign conversations (#2192)

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

lib/events/types.rb

@@ -6,6 +6,9 @@ module Events::Types
   ACCOUNT_CREATED = 'account.created'
 
   #### Account Events ###
+  # campaign events
+  CAMPAIGN_TRIGGERED = 'campaign.triggered'
+
   # channel events
   WEBWIDGET_TRIGGERED = 'webwidget.triggered'
 
@@ -15,6 +18,7 @@ module Events::Types
   # FIXME: deprecate the opened and resolved events in future in favor of status changed event.
   CONVERSATION_OPENED = 'conversation.opened'
   CONVERSATION_RESOLVED = 'conversation.resolved'
+
   CONVERSATION_STATUS_CHANGED = 'conversation.status_changed'
   CONVERSATION_CONTACT_CHANGED = 'conversation.contact_changed'
   ASSIGNEE_CHANGED = 'assignee.changed'