Janus

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- Drop Python 3.6 support

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- Add SyncQueue and AsyncQueue Protocols to provide type hints for sync and async queues 374

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- Fix Python 3.10 compatibility 358

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- Raise RuntimeError on queue.join() after queue closing. 295

- Replace ``timeout`` type from ``Optional[int]`` to ``Optional[float]`` 267

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- Drop Python 3.5, the minimal supported version is Python 3.6

- Support Python 3.9

- Refomat with ``black``

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- Remove explicit loop arguments and forbid creating queues outside event loops 246