make ThreadedProducer clonable like BaseProducer
#731
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The threaded producer was not `Clone` due to handling the background thread join handle but that can easily be stored in an `Arc` that the last drop of the client unwraps and terminates the background thread. `Arc::into_inner` guarantees that exactly one thread will manage to unwrap the handle.
petrosagg
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The threaded producer was not
Clonedue to handling the background thread join handle but that can easily be stored in anArcthat the last drop of the client unwraps and terminates the background thread.Arc::into_innerguarantees that exactly one thread will manage to unwrap the handle.