[issue32364] Add AbstractFuture and AbstractTask

[Yury Selivanov]

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

+1, let's do it.  I'd add a new module - 'asyncio.abc' and put them both there (as well as asyncio.isfuture() function).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32364>
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