Async function call

Hi, is there a way to make a python function call async, i.e. integrate with julia's async capabilities. For e.g. while making a slow network request in a function call, the code can jump to some other task. I suppose once julia has proper threading, one could just launch a new thread for such a call.

The issue names no files, tests, or entry points. First determine the intended PyCall.jl API for allowing a Python call, such as a slow network request, to yield to another Julia task, and clarify the threading or task-scheduling constraints. Done should include an agreed design, implementation scope, and tests demonstrating that another task can run while the Python call is in progress.

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