Play and Show NowPlaying MediaItem when clicked on Android Auto

[bensalcie]

Adding this snippet enables you to play MediaItems on Android Auto, and shows the correct Playing information on click.

    @override
    Future<void> playFromMediaId(String mediaId,
        [Map<String, dynamic>? extras]) async {
      //Get the index of the item on the queue
  
      var index = queue.value.indexWhere((element) => element.id == mediaId);
  
      // Skip to the item to start playing.
      await skipToQueueItem(index);
    }