Adding read_into method to asyncio.StreamReader

[jakirkham]

BPO	43096
Nosy	@asvetlov, @1st1, @jakirkham

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-02-01.21:14:14.697>
labels = ['3.11', 'type-feature', '3.10', 'expert-asyncio']
title = 'Adding `read_into` method to `asyncio.StreamReader`'
updated_at = <Date 2021-09-27.19:08:01.710>
user = 'https://github.com/jakirkham'

bugs.python.org fields:

activity = <Date 2021-09-27.19:08:01.710>
actor = 'jakirkham'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['asyncio']
creation = <Date 2021-02-01.21:14:14.697>
creator = 'jakirkham'
dependencies = []
files = []
hgrepos = []
issue_num = 43096
keywords = []
message_count = 1.0
messages = ['386114']
nosy_count = 3.0
nosy_names = ['asvetlov', 'yselivanov', 'jakirkham']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue43096'
versions = ['Python 3.10', 'Python 3.11']

[jakirkham]

To allow reading into a provided buffer without copying, it would be useful to have a read_into method on asyncio.StreamReader, which takes a buffer supporting the buffer protocol and fills it.

[kumaraditya303]

Duplicate of #85477