[issue36802] Revert back StreamWriter awrite/aclose but provide await writer.write() and await writer.close()

[Andrew Svetlov]

New submission from Andrew Svetlov <andrew.svetlov at gmail.com>:

Yuri and I decided that `writer.awrite()` and `writer.aclose()` look ugly.

Instead, we return awaitable object from these methods to allow both `writer.write(b'data')` and `await writer.write(b'data')` for the method.

The same for `writer.close()` call.

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components: asyncio
messages: 341450
nosy: asvetlov, yselivanov
priority: normal
severity: normal
status: open
title: Revert back StreamWriter awrite/aclose but provide await writer.write() and await writer.close()
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36802>
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