Feature Request: add EHOSTUNREACH subclass to ConnectionError

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-10-24.08:30:10.418>
labels = ['type-feature', 'library', '3.11']
title = 'Feature Request: add EHOSTUNREACH subclass to ConnectionError'
updated_at = <Date 2021-10-24.08:53:25.306>
user = 'https://github.com/ntc2'

bugs.python.org fields:

activity = <Date 2021-10-24.08:53:25.306>
actor = 'ntc2'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-10-24.08:30:10.418>
creator = 'ntc2'
dependencies = []
files = []
hgrepos = []
issue_num = 45594
keywords = []
message_count = 2.0
messages = ['404917', '404919']
nosy_count = 1.0
nosy_names = ['ntc2']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45594'
versions = ['Python 3.11']