Add _PyType_GetModuleByDef

[encukou]

BPO	42100
Nosy	@encukou, @shihai1991, @erlend-aasland
PRs	bpo-42100: Add _PyType_GetModuleByDef #22835

^{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 2020-11-03.22:30:44.576>
created_at = <Date 2020-10-20.20:35:05.508>
labels = ['expert-C-API', 'type-feature', '3.10']
title = 'Add _PyType_GetModuleByDef'
updated_at = <Date 2020-11-03.22:30:44.576>
user = 'https://github.com/encukou'

bugs.python.org fields:

activity = <Date 2020-11-03.22:30:44.576>
actor = 'petr.viktorin'
assignee = 'none'
closed = True
closed_date = <Date 2020-11-03.22:30:44.576>
closer = 'petr.viktorin'
components = ['C API']
creation = <Date 2020-10-20.20:35:05.508>
creator = 'petr.viktorin'
dependencies = []
files = []
hgrepos = []
issue_num = 42100
keywords = ['patch']
message_count = 1.0
messages = ['379163']
nosy_count = 3.0
nosy_names = ['petr.viktorin', 'shihai1991', 'erlendaasland']
pr_nums = ['22835']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42100'
versions = ['Python 3.10']

[encukou]

I would like to add an internal _PyType_GetModuleByDef function to unblock further work on isolating extension modules, as discussed here: https://mail.python.org/archives/list/capi-sig@python.org/thread/T3P2QNLNLBRFHWSKYSTPMVEIL2EEKFJU/