Implement PEP 591: add Final qualifier and @final decorator to typing

[ilevkivskyi]

BPO	37045
Nosy	@gvanrossum, @ilevkivskyi, @msullivan
PRs	bpo-37045: PEP 591: Add final qualifiers to typing module #13571 bpo-37045: Add one more test for typing.Final #13588

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/ilevkivskyi'
closed_at = <Date 2019-05-26.08:43:55.247>
created_at = <Date 2019-05-25.18:29:03.772>
labels = ['3.8', 'type-feature', 'library']
title = 'Implement PEP 591: add Final qualifier and @final decorator to typing'
updated_at = <Date 2019-05-26.21:27:38.087>
user = 'https://github.com/ilevkivskyi'

bugs.python.org fields:

activity = <Date 2019-05-26.21:27:38.087>
actor = 'levkivskyi'
assignee = 'levkivskyi'
closed = True
closed_date = <Date 2019-05-26.08:43:55.247>
closer = 'levkivskyi'
components = ['Library (Lib)']
creation = <Date 2019-05-25.18:29:03.772>
creator = 'levkivskyi'
dependencies = []
files = []
hgrepos = []
issue_num = 37045
keywords = ['patch']
message_count = 2.0
messages = ['343501', '343538']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'levkivskyi', 'msullivan']
pr_nums = ['13571', '13588']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue37045'
versions = ['Python 3.8']

[ilevkivskyi]

The actual implementation is performed by type checkers like mypy. We just need to add the names to the typing module.

[ilevkivskyi]

New changeset f367242 by Ivan Levkivskyi in branch 'master':
bpo-37045: PEP-591: Add final qualifiers to typing module (GH-13571)
f367242