feat: Add basic typing support #619

Job	Run time
Python 3.8, Database sqlite	1m 55s
Python 3.8, Database postgres	1m 55s
Python 3.8, Database typecheck	1m 55s
Python 3.9, Database sqlite	1m 54s
Python 3.9, Database postgres	1m 55s
Python 3.9, Database typecheck	1m 54s
Python 3.10, Database sqlite	1m 56s
Python 3.10, Database postgres	1m 57s
Python 3.10, Database typecheck	1m 56s
Python 3.11, Database sqlite	1m 56s
Python 3.11, Database postgres	1m 55s
Python 3.11, Database typecheck	1m 55s
Python 3.12, Database sqlite	1m 56s
Python 3.12, Database postgres	1m 55s
Python 3.12, Database typecheck	1m 56s
Python pypy-3.9, Database sqlite	1m 54s
Python pypy-3.9, Database postgres	1s
Python pypy-3.9, Database typecheck	1m 55s
Python pypy-3.10, Database sqlite	1m 53s
Python pypy-3.10, Database postgres	1m 54s
Python pypy-3.10, Database typecheck	1m 54s
	38m 21s

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