Deprecate the parser module

BPO	37268
Nosy	@vstinner, @pablogsal, @miss-islington
PRs	bpo-37268: Add deprecation notice and a DeprecationWarning for the parser module #15017 bpo-37268: test_parser fails when run with -Werror #15183

^{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 = None
closed_at = <Date 2019-07-30.12:49:09.010>
created_at = <Date 2019-06-13.12:11:39.721>
labels = ['3.8', 'library']
title = 'Deprecate the parser module'
updated_at = <Date 2019-08-08.21:48:04.757>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2019-08-08.21:48:04.757>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2019-07-30.12:49:09.010>
closer = 'pablogsal'
components = ['Library (Lib)']
creation = <Date 2019-06-13.12:11:39.721>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 37268
keywords = ['patch']
message_count = 8.0
messages = ['345504', '345506', '345507', '345522', '348704', '348706', '348735', '349260']
nosy_count = 3.0
nosy_names = ['vstinner', 'pablogsal', 'miss-islington']
pr_nums = ['15017', '15183']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue37268'
versions = ['Python 3.8']