[issue41305] Add StreamReader.readinto()

[Yury Selivanov]

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

> Is it simply combining stream reader and stream writer into a single object and changing the write() function to always wait the write (thus deprecating drain) and that's it?

Pretty much. We might also rename a few APIs here and there, like "close()" should become an "async def aclose()"

We also will likely want to define a few ABCs.

Which brings me to the most important point: what we need it not coding it (yet), but rather drafting the actual proposal and posting it to https://discuss.python.org/c/async-sig/20.  Once a formal proposal is there we can proceed with the implementation.

It's a bit of a process to follow, but we have to do it this way.

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nosy: +aeros, njs

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