[issue38148] Add slots to asyncio transports

[Andrew Svetlov]

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

Transports are abstract interfaces.
Adding slots allows using slots in transport implementations as well.
If the implementation doesn't use slots -- everything keeps working.

Slots can help with saving a memory footprint a little.

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components: asyncio
messages: 352239
nosy: asvetlov, yselivanov
priority: normal
severity: normal
status: open
title: Add slots to asyncio transports
versions: Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38148>
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