[Async-sig] set_blocking_signal_threshold equivalent for asyncio?

[Yusuke Tsutsumi]

Hi,

In tornado, there's a really nice feature called
set_blocking_signal_threshold, which sets a signal that fires if a
coroutine has been running for too long without returning control back to
the main loop:

https://www.tornadoweb.org/en/stable/ioloop.html?highlight=signal#tornado.ioloop.IOLoop.set_blocking_signal_threshold

In tornado this will then log the traceback of the coroutine in question.
This has been a very valuable tool when a developer accidentally introduces
code that blocks the event loop for way too long of a time.

Is there an equivalent in asyncio? I have a sketch in my head of how to
implement that, but wanted to see if it existed somewhere first.

Thanks!
-Yusuke
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