Allow inheritance of Venvs

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-10-20.21:18:09.031>
labels = ['type-feature', '3.10']
title = 'Allow inheritance of Venvs'
updated_at = <Date 2020-11-25.02:00:03.340>
user = 'https://github.com/Carreau'

bugs.python.org fields:

activity = <Date 2020-11-25.02:00:03.340>
actor = 'mbussonn'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2020-10-20.21:18:09.031>
creator = 'mbussonn'
dependencies = []
files = []
hgrepos = []
issue_num = 42101
keywords = ['patch']
message_count = 1.0
messages = ['379164']
nosy_count = 1.0
nosy_names = ['mbussonn']
pr_nums = ['23504']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42101'
versions = ['Python 3.10']