Django-camunda

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Improved DMN handling

**Breaking changes**

* Dropped support for Python 3.9 and 3.10.
* Dropped support for Django versions older than 4.2.
* The DMN parsing types are refactored into dataclasses rather than dicts..

**Changes**

* Rewritten DMN parser, input and output clauses for a table now correctly process
dependencies.
* Deleted dead/unused code.
* Cleaned up tests.
* Updated CI configuration.

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* Updated Github actions and Tox to test django 4.1 and 4.2 and dropped python 3.7.
* Removed typing extension dependency (was only needed for python 3.7).
* Replaced defusedxml.lxml module with lxml.
* Added parser for XML of Camunda decision definitions.

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* Fixed serialize utility for ``OrderedDict``
* Formatted code with latest black version
* Disable browser autocomplete for password field in config admin

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* Added changelog
* Dropped supported for Django 2.2
* Added initial DMN functionality

* Implement evaluating a DMN table by ID or key
* Implement introspecing a DMN table by ID or key

* Exposed types
* Improved type hints