Add a len() method to Sink for some insight into the queue state. #220
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This seems like a natural addition to the Sink API.
Actually stems from me struggling to get librespot integration working properly. The decoding thread depends on a the audio backend to control it's execution rate.
I tried creating a new source iterator with a sync_channel to the the Librespot Sink but I couldn't get it to work. And it was far more complicated than I would have liked. If this doesn't get accepted I'll take another look at a route like that (a blocking buffer Source which can be written to once it's already playing).