EventSource Refactor

Move showing th event source to a call to RoomManager. This means the SourceRole is no longer required in the message and search models

src/neochatroom.h

@@ -551,6 +551,8 @@ public:
      */
     Q_INVOKABLE void reportEvent(const QString &eventId, const QString &reason);
 
+    Q_INVOKABLE QByteArray getEventJsonSource(const QString &eventId);
+
     [[nodiscard]] bool readMarkerLoaded() const;
 
     /**