Implement PEP 586: add Literal type constructor to typing

[ilevkivskyi]

BPO	37046
Nosy	@gvanrossum, @Michael0x2a, @ilevkivskyi
PRs	bpo-37046: PEP 586: Add Literal to typing module #13572

^{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 2019-05-26.08:43:34.167>
created_at = <Date 2019-05-25.19:08:01.146>
labels = ['3.8', 'type-feature', 'library']
title = 'Implement PEP 586: add Literal type constructor to typing'
updated_at = <Date 2019-05-26.08:43:34.167>
user = 'https://github.com/ilevkivskyi'

bugs.python.org fields:

activity = <Date 2019-05-26.08:43:34.167>
actor = 'levkivskyi'
assignee = 'levkivskyi'
closed = True
closed_date = <Date 2019-05-26.08:43:34.167>
closer = 'levkivskyi'
components = ['Library (Lib)']
creation = <Date 2019-05-25.19:08:01.146>
creator = 'levkivskyi'
dependencies = []
files = []
hgrepos = []
issue_num = 37046
keywords = ['patch']
message_count = 2.0
messages = ['343503', '343539']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'michael0x2a', 'levkivskyi']
pr_nums = ['13572']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue37046'
versions = ['Python 3.8']

[ilevkivskyi]

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

[ilevkivskyi]

New changeset b891c46 by Ivan Levkivskyi in branch 'master':
bpo-37046: PEP-586: Add Literal to typing module (bpo-13572)
b891c46