Test

Allow running the mongo test suite against mongomock #698

Job	Run time
Python 3.8, Database sqlite	1m 14s
Python 3.8, Database postgres	1m 10s
Python 3.9, Database sqlite	1m 19s
Python 3.9, Database postgres	1m 14s
Python 3.10, Database sqlite	1m 56s
Python 3.10, Database postgres	1m 55s
Python 3.11, Database sqlite	1m 25s
Python 3.11, Database postgres	1m 30s
Python 3.12, Database sqlite	1m 28s
Python 3.12, Database postgres	1m 28s
Python pypy-3.9, Database sqlite	2m 37s
Python pypy-3.9, Database postgres	2m 8s
Python pypy-3.10, Database sqlite	2m 37s
Python pypy-3.10, Database postgres	1m 55s
	23m 56s

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