Test

Allow running the mongo test suite against mongomock #696

Job	Run time
Python 3.8, Database sqlite	1m 12s
Python 3.8, Database postgres	1m 9s
Python 3.9, Database sqlite	1m 12s
Python 3.9, Database postgres	1m 14s
Python 3.10, Database sqlite	2m 4s
Python 3.10, Database postgres	1m 53s
Python 3.11, Database sqlite	1m 31s
Python 3.11, Database postgres	1m 24s
Python 3.12, Database sqlite	1m 28s
Python 3.12, Database postgres	1m 35s
Python pypy-3.9, Database sqlite	2m 41s
Python pypy-3.9, Database postgres	2m 2s
Python pypy-3.10, Database sqlite	2m 48s
Python pypy-3.10, Database postgres	2m 3s
	24m 16s

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