Add a StreamReaderBufferedProtocol

[tontinton]

BPO	41279
Nosy	@asvetlov, @1st1, @tontinton
PRs	bpo-41279: Add StreamReaderBufferedProtocol #21446 bpo-41305: Add StreamReader.readinto() #21491

^{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 2020-07-11.16:23:40.362>
labels = ['expert-asyncio']
title = 'Add a StreamReaderBufferedProtocol'
updated_at = <Date 2020-08-29.21:19:22.551>
user = 'https://github.com/tontinton'

bugs.python.org fields:

activity = <Date 2020-08-29.21:19:22.551>
actor = 'tontinton'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['asyncio']
creation = <Date 2020-07-11.16:23:40.362>
creator = 'tontinton'
dependencies = []
files = []
hgrepos = []
issue_num = 41279
keywords = ['patch']
message_count = 2.0
messages = ['373526', '376079']
nosy_count = 3.0
nosy_names = ['asvetlov', 'yselivanov', 'tontinton']
pr_nums = ['21446', '21491']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue41279'
versions = []

[tontinton]

This will greatly increase performance, from my internal tests it was about 150% on linux.

Using read_into instead of read will make it so we do not allocate a new buffer each time data is received.

[tontinton]

bump