[issue32309] Implement asyncio.run_in_executor shortcut

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

> I'm going to have to rescind the above statements. I was able to implement a new prototype of asyncio.ThreadPool (using ThreadPoolExecutor) that spawns it's threads asynchronously on startup. Since this one a bit more involved than the previous code examples, I created a gist: https://gist.github.com/aeros/8a86de6b13f17b9f717ea539ee1ee78f

Nice work! This is a great excercise, but we can really just use concurrent.futures.ThreadPool as is. Spawning threads is fast. As I mentioned before all we need to do is to design *our* API to NOT initialize pools in __init__, that's it. The design outlined in https://bugs.python.org/msg355881 would do that.

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