Support Windows pseudoterminals in pty and termios modules

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-08-29.18:28:07.465>
labels = ['type-feature', 'library', '3.10']
title = 'Support Windows pseudoterminals in pty and termios modules'
updated_at = <Date 2021-11-07.20:00:06.199>
user = 'https://github.com/cs01'

bugs.python.org fields:

activity = <Date 2021-11-07.20:00:06.199>
actor = 'pradyunsg'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-08-29.18:28:07.465>
creator = 'cs01'
dependencies = []
files = []
hgrepos = []
issue_num = 41663
keywords = []
message_count = 2.0
messages = ['376071', '405911']
nosy_count = 3.0
nosy_names = ['steve.dower', 'pradyunsg', 'cs01']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41663'
versions = ['Python 3.10']