Make playback state, queue available with one synchronous request

[hacker1024]

There's no way to get the playback state or queue synchronously, on demand. Perhaps this can be done by simply caching them in a variable when the plugin receives them? I'll make a pull request.

[hacker1024]

To clarify, I mean there's no way to access them from the UI isolate.

[hacker1024]

Implemented: #24 .

[ryanheise]

Looks great, thanks. I just merged it.

[github-actions]

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