Allow applications to tune the condition that triggers a GIL release and implementation choice in hashlib

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-03-30.21:28:38.739>
labels = ['type-feature']
title = 'Allow applications to tune the condition that triggers a GIL release and implementation choice in hashlib'
updated_at = <Date 2022-03-30.21:28:38.739>
user = 'https://github.com/gpshead'

bugs.python.org fields:

activity = <Date 2022-03-30.21:28:38.739>
actor = 'gregory.p.smith'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2022-03-30.21:28:38.739>
creator = 'gregory.p.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 47175
keywords = []
message_count = 1.0
messages = ['416401']
nosy_count = 1.0
nosy_names = ['gregory.p.smith']
pr_nums = []
priority = 'low'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue47175'
versions = []