feat: add optional pyomq backend for ZMQ connectors - #281
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Add a small backend selector for ZMQ imports so existing PyZMQ behavior remains default while PLUGBOARD_ZMQ_BACKEND=pyomq can use pyomq. Wire the ZMQ channel and proxy through the selector, add the optional plugboard[omq] extra, and cover backend selection plus pyomq socket/proxy smoke paths.
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PLUGBOARD_ZMQ_BACKENDbackend selector for ZMQ imports.PLUGBOARD_ZMQ_BACKEND=pyomqforZMQChannelandZMQProxy.plugboard[omq]optional extra withpyomq>=0.20.1,<1.Benchmarks:
ZMQChannelover TCP loopback with 2 Python processes, multipart[topic, payload], pickle/unpickle included, best of 5 runs.33.0k msg/s, pyomq145.0k msg/s, about4.4xfaster.32.4k msg/s, pyomq147.1k msg/s, about4.5xfaster.30.0k msg/s, pyomq128.2k msg/s, about4.3xfaster.