Optionally support rounding for math.isqrt()

GitHub fields:

assignee = 'https://github.com/mdickinson'
closed_at = None
created_at = <Date 2021-12-27.19:29:59.437>
labels = ['type-feature', 'library', '3.11']
title = 'Optionally support rounding for math.isqrt()'
updated_at = <Date 2022-02-06.13:23:47.677>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2022-02-06.13:23:47.677>
actor = 'mark.dickinson'
assignee = 'mark.dickinson'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-12-27.19:29:59.437>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 46187
keywords = []
message_count = 27.0
messages = ['409243', '409244', '409264', '409278', '409279', '409281', '409294', '409312', '409361', '409362', '409378', '409395', '409397', '409405', '409406', '409423', '409425', '409426', '409427', '409474', '409523', '409634', '409655', '409689', '412592', '412628', '412631']
nosy_count = 5.0
nosy_names = ['tim.peters', 'rhettinger', 'mark.dickinson', 'casevh', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue46187'
versions = ['Python 3.11']