Notifications-api-common

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* Update setup-config docs to use example directive and add extra example values to models

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* Changes to ``Kanaal.get_kenmerken`` to:

* support nested kenmerken
* allow using the ``request`` parameter
* specify custom help texts for kenmerken
* Add ``generate_notificaties`` management command (ported over from ``commonground-api-common``)
* Update existing kanalen when running the ``register_kanalen`` management command

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* Added an ``identifier`` field to the ``Subscription`` model
* Introduced support for ``django-setup-configuration`` and added two
``ConfigurationStep`` implementations: ``NotificationConfigurationStep`` and
``NotificationSubscriptionConfigurationStep``

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* Fixed kanalen not being registered. This regression was introduced in ``0.3.0``.

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* Upgraded Django requirement to >= 4.2
* Upgraded minimum python requirement to >= 3.10
* Added python 3.12 support
* Added the ``NOTIFICATIONS_GUARANTEE_DELIVERY`` environment variable which allows
``RuntimeError`` to be raised (or not to) whenever no Notifications API is
configured. The default for this setting is set to ``True``.
* Upgraded zgw-consumers to 0.35.1

* This removed support for retrieving external OAS files to determine
* This requires ``zgw_consumers.models.Service`` ("service") instances to be
created to do external API calls through ``zgw_consumers``

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Fixed a crash in migrations during fresh installs when using the latest zgw-consumers.