Add basic typing support #636

Job	Run time
Python 3.8, Database sqlite	1m 38s
Python 3.8, Database postgres	1m 37s
Python 3.9, Database sqlite	1m 42s
Python 3.9, Database postgres	1m 41s
Python 3.10, Database sqlite	2m 25s
Python 3.10, Database postgres	2m 15s
Python 3.11, Database sqlite	1m 48s
Python 3.11, Database postgres	1m 50s
Python 3.12, Database sqlite	1m 29s
Python 3.12, Database postgres	1m 19s
Python pypy-3.9, Database sqlite	3m 35s
Python pypy-3.9, Database postgres	2m 30s
Python pypy-3.10, Database sqlite	3m 13s
Python pypy-3.10, Database postgres	2m 41s
	29m 43s

Provide feedback