[issue36889] Merge StreamWriter and StreamReader into just asyncio.Stream

[Yury Selivanov]

Change by Yury Selivanov <yselivanov at gmail.com>:


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pull_requests: +16071
pull_request: https://github.com/python/cpython/pull/16485

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36889>
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