feat: Add a view for mentions (#3505)

- Added a new table mentions for saving user mentions
- Added a filter conversation_type in the API
- Added a view to see the mentions

app/javascript/dashboard/helper/actionCable.js

@@ -21,6 +21,7 @@ class ActionCableConnector extends BaseActionCableConnector {
       'presence.update': this.onPresenceUpdate,
       'contact.deleted': this.onContactDelete,
       'contact.updated': this.onContactUpdate,
+      'conversation.mentioned': this.onConversationMentioned,
     };
   }
 
@@ -97,6 +98,10 @@ class ActionCableConnector extends BaseActionCableConnector {
     });
   };
 
+  onConversationMentioned = data => {
+    this.app.$store.dispatch('addMentions', data);
+  };
+
   clearTimer = conversationId => {
     const timerEvent = this.CancelTyping[conversationId];