Add PyModule_AddType helper function

[corona10]

BPO	40024
Nosy	@vstinner, @corona10, @shihai1991, @aeros
PRs	bpo-40024: Add PyModule_AddType() helper function #19088 bpo-40024: Update xxxxmodule to use PyModule_AddType. #19119 bpo-40024: Update _elementtree to use PyModule_AddType #19205

^{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/corona10'
closed_at = <Date 2020-03-29.14:13:27.053>
created_at = <Date 2020-03-20.09:39:49.300>
labels = ['expert-C-API', 'type-feature', '3.9']
title = 'Add PyModule_AddType helper function'
updated_at = <Date 2020-04-01.22:33:07.698>
user = 'https://github.com/corona10'

bugs.python.org fields:

activity = <Date 2020-04-01.22:33:07.698>
actor = 'aeros'
assignee = 'corona10'
closed = True
closed_date = <Date 2020-03-29.14:13:27.053>
closer = 'vstinner'
components = ['C API']
creation = <Date 2020-03-20.09:39:49.300>
creator = 'corona10'
dependencies = []
files = []
hgrepos = []
issue_num = 40024
keywords = ['patch']
message_count = 7.0
messages = ['364661', '364809', '364964', '365217', '365253', '365254', '365522']
nosy_count = 4.0
nosy_names = ['vstinner', 'corona10', 'shihai1991', 'aeros']
pr_nums = ['19088', '19119', '19205']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40024'
versions = ['Python 3.9']

[corona10]

See: #19084 (comment)

[vstinner]

New changeset 05e4a29 by Dong-hee Na in branch 'master':
bpo-40024: Add PyModule_AddType() helper function (GH-19088)
05e4a29

[vstinner]

New changeset 37fcbb6 by Dong-hee Na in branch 'master':
bpo-40024: Update C extension modules to use PyModule_AddType() (GH-19119)
37fcbb6

[corona10]

@vstinner

IMHO, we can close this issue after PR 19205 is merged.
Most of use cases are replaced to PyModule_AddType.

[vstinner]

New changeset 016bdd5 by Dong-hee Na in branch 'master':
bpo-40024: Update _elementtree to use PyModule_AddType() (GH-19205)
016bdd5

[vstinner]

Thanks Dong-hee Na for fixing many reference leaks! I like the new PyModule_AddType() helper function.

[aeros]

(disregard the above, the PR was mistakenly linked from a GitHub bug)