Defer Django and sqlalchemy imports #670

Job	Run time
Python 3.8, Database sqlite	1m 41s
Python 3.8, Database postgres	1m 34s
Python 3.9, Database sqlite	1m 41s
Python 3.9, Database postgres	1m 32s
Python 3.10, Database sqlite	2m 26s
Python 3.10, Database postgres	2m 28s
Python 3.11, Database sqlite	1m 47s
Python 3.11, Database postgres	1m 46s
Python 3.12, Database sqlite	1m 39s
Python 3.12, Database postgres	1m 26s
Python pypy-3.9, Database sqlite	3m 32s
Python pypy-3.9, Database postgres	2m 51s
Python pypy-3.10, Database sqlite	3m 33s
Python pypy-3.10, Database postgres	2m 50s
	30m 46s

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