Test

Allow running the mongo test suite against mongomock #697

Job	Run time
Python 3.8, Database sqlite	1m 9s
Python 3.8, Database postgres	1m 11s
Python 3.9, Database sqlite	1m 14s
Python 3.9, Database postgres	1m 18s
Python 3.10, Database sqlite	1m 57s
Python 3.10, Database postgres	1m 58s
Python 3.11, Database sqlite	1m 30s
Python 3.11, Database postgres	1m 26s
Python 3.12, Database sqlite	1m 29s
Python 3.12, Database postgres	1m 25s
Python pypy-3.9, Database sqlite	2m 42s
Python pypy-3.9, Database postgres	2m 1s
Python pypy-3.10, Database sqlite	2m 56s
Python pypy-3.10, Database postgres	2m 10s
	24m 26s

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