Fix notifications for membership changes too

crates/live_kit_server/src/token.rs

@@ -57,6 +57,15 @@ impl<'a> VideoGrant<'a> {
             ..Default::default()
         }
     }
+
+    pub fn for_guest(room: &'a str) -> Self {
+        Self {
+            room: Some(Cow::Borrowed(room)),
+            room_join: Some(true),
+            can_subscribe: Some(true),
+            ..Default::default()
+        }
+    }
 }
 
 pub fn create(