Adds isVisitor function and fields to joined event.

docs/dev-guide/iframe-events.md

@@ -635,7 +635,8 @@ The listener receives an object with the following structure:
     id: string, // the id of the local participant
     displayName: string, // the display name of the local participant
     avatarURL: string, // the avatar URL of the local participant
-    breakoutRoom: boolean // whether the current room is a breakout room
+    breakoutRoom: boolean, // whether the current room is a breakout room
+    visitor: boolean // whether the current user is a visitor
 }
 ```
 

docs/dev-guide/iframe-functions.md

@@ -409,6 +409,14 @@ api.isVideoAvailable().then(available => {
 });
 ```
 
+### isVisitor
+
+Returns a whether the current user is a visitor or not.
+
+```javascript
+const isVisitor = api.isVisitor();
+```
+
 ### isModerationOn
 
 Returns a Promise which resolves to the current moderation state of the given media type.