feat(visitors): Handles live conference and queue service. (#14869)

* feat(visitors): Handling of live conference and queue service.

* squash: Small refactor mobile code.

* squash: Drop debug log.

* chore(deps) lib-jitsi-meet@latest

https://github.com/jitsi/lib-jitsi-meet/compare/v1836.0.0+d05325f3...v1839.0.0+ea523fc6

* squash: Adds a count function.

* squash: Drop debug print.

* squash: Skip if queueService is not enabled.

* squash: Avoids double subscribing for visitorsWaiting.

* squash: Fixes lint error.

* squash: Fixes showing dialog.

react/features/base/config/reducer.ts

@@ -80,6 +80,7 @@ export interface IConfigState extends IConfig {
             audio?: boolean;
             video?: boolean;
         };
+        queueService: string;
     };
 }