Add Async Factory Support #614

Job	Run time
Python 3.8, Database sqlite	1m 13s
Python 3.8, Database postgres	1m 7s
Python 3.9, Database sqlite	1m 15s
Python 3.9, Database postgres	1m 23s
Python 3.10, Database sqlite	1m 50s
Python 3.10, Database postgres	1m 43s
Python 3.11, Database sqlite	1m 14s
Python 3.11, Database postgres	1m 11s
Python 3.12, Database sqlite	33s
Python 3.12, Database postgres	43s
Python pypy-3.9, Database sqlite	2m 8s
Python pypy-3.9, Database postgres	2m 0s
Python pypy-3.10, Database sqlite	2m 7s
Python pypy-3.10, Database postgres	2m 13s
	20m 40s

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