[#9] Make retrieval of Open Forms choices lazy #50

Job	Run time
Run the test suite (Python 3.7, Django 3.2)	3h 3m 20s
Run the test suite (Python 3.7, Django 3.2)	6h 0m 1s
Run the test suite (Python 3.8, Django 3.2)	3h 1m 52s
Run the test suite (Python 3.8, Django 3.2)	3h 1m 52s
Run the test suite (Python 3.8, Django 4.0)	3h 1m 49s
Run the test suite (Python 3.8, Django 4.0)	3h 1m 49s
Run the test suite (Python 3.9, Django 3.2)	2h 59m 46s
Run the test suite (Python 3.9, Django 3.2)	2h 59m 46s
Run the test suite (Python 3.9, Django 4.0)	2h 59m 40s
Run the test suite (Python 3.9, Django 4.0)	2h 59m 40s
Run the test suite (Python 3.10, Django 3.2)	3h 3m 24s
Run the test suite (Python 3.10, Django 3.2)	3h 3m 24s
Run the test suite (Python 3.10, Django 4.0)	3h 3m 52s
Run the test suite (Python 3.10, Django 4.0)	3h 3m 52s
Publish package to PyPI	1s
Publish package to PyPI	0s
	1d 21h 24m 8s

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