Zgw-consumers

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* Fixed bug in ``get_paginated_results`` function
* Fixed bug in compatibility layer for zds-client v1/v2

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Fixed missing prefix in default constraint name

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Feature release

* ``ServiceUrlField`` now creates check constraints to guarantee data consistency

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Feature release

* Added support for zds-client 2.0

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Fixed the API models to be more compliant with the ZGW API standards.

(Most) fields that are not required in the API schema can now effectively be omitted
from the response and still work with the API models.

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* Fixed the usage of ServiceUrlField in nested queries.