Add API to add and delete a list of mediaitems

[DylanXie123]

Is your feature request related to a problem? Please describe.
In my own BackgroundAudioTask, I override onAddQueueItem` like this:

  @override
  void onAddQueueItem(MediaItem mediaItem) {
    if (!_queue.contains(mediaItem)) {
      _queue.add(mediaItem);
      AudioServiceBackground.setQueue(_queue);
    }
  }

But I need to add a list of MediaItem in my project constantly, I believe it's not the best practice to call AudioService.addQueueItem for each MediaItem in my list because that will cause unnecessary Widget rebuild. Same problems occurs when I try to clear queue.

Describe the solution you'd like
I hope there is API to add and delete list of mediaitems.

[ryanheise]

The reason this is not already provided as a standard message is that the plugin is based on a protocol for how clients would typically interact with a media player (think of Android Auto). But there is no reason why I couldn't support extra messages like this for special use cases.

In the meantime you can use however use a custom action.

[ryanheise]

@DylanXie123 can you clarify your use case: May I ask, do you really want to add and delete lists, or do you want to replace the current queue by another queue?

I've just implemented a AudioService.replaceQueue method for this purpose, but I want to understand if you actually need the ability to delete a specific list (even maybe a subset of the queue) as an atomic operation.

[DylanXie123]

I believe AudioService.replaceQueue can work in my use case, I'll try it out later.

[DylanXie123]

This new API do works well in my APP, thanks for your amazing job!

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