Support the same files with new param in shutil.copyfile

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-02-08.17:32:01.861>
labels = ['type-feature', 'library', '3.10']
title = 'Support the same files with new param in shutil.copyfile'
updated_at = <Date 2021-03-18.08:31:52.431>
user = 'https://github.com/milanbalazs'

bugs.python.org fields:

activity = <Date 2021-03-18.08:31:52.431>
actor = 'milanbalazs'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-02-08.17:32:01.861>
creator = 'milanbalazs'
dependencies = []
files = []
hgrepos = []
issue_num = 43165
keywords = ['patch']
message_count = 4.0
messages = ['386634', '386639', '386641', '388998']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'milanbalazs']
pr_nums = ['24482']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue43165'
versions = ['Python 3.10']