[issue38242] Revert the new asyncio Streams API

[Yury Selivanov]

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

I've reverted the code. Andrew, would really appreciate if you could quickly do a post commit review.

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stage: patch review -> commit review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38242>
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