Tests

[WIP] Memoize the options snapshot #21997

Job	Run time
Test mypyc suite with 32-bit Python	11m 6s
Test suite with py314-ubuntu, mypyc-compiled	15m 29s
Test suite with py310-ubuntu, mypyc-compiled	16m 40s
Test suite with py313-ubuntu, mypyc-compiled	15m 56s
Parallel tests with py314-windows-64, interpreted	11m 52s
mypyc runtime tests with py313-macos	5m 22s
Test suite with py311-ubuntu	9m 23s
Test suite with py314t-ubuntu, mypyc-compiled	18m 2s
Test suite with py312-ubuntu	9m 37s
Test suite with py314-windows-64	31m 8s
Formatting and code style with Black + ruff	1m 59s
Type check our own code (py310-windows-64)	2m 7s
Type check our own code (py310-ubuntu)	1m 10s
mypyc runtime tests with py310-ubuntu	6m 47s
Parallel tests with py314-ubuntu, interpreted	27m 31s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 24s
	3h 33m 33s

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