Tests

[mypyc] Document librt.strings (#21374) #22062

Job	Run time
Test mypyc suite with 32-bit Python	10m 43s
Test suite with py314-ubuntu, mypyc-compiled	15m 55s
mypyc runtime tests with py310-ubuntu	6m 32s
Test suite with py314t-ubuntu, mypyc-compiled	17m 23s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 47s
Test suite with py314-windows-64	30m 22s
Test suite with py311-ubuntu	9m 26s
Parallel tests with py314-ubuntu, interpreted	24m 56s
Type check our own code (py310-windows-64)	1m 48s
Test suite with py313-ubuntu, mypyc-compiled	15m 50s
Test suite with py312-ubuntu	9m 54s
Parallel tests with py314-windows-64, interpreted	9m 34s
Type check our own code (py310-ubuntu)	1m 16s
Formatting and code style with Black + ruff	1m 48s
Test suite with py310-ubuntu, mypyc-compiled	16m 16s
mypyc runtime tests with py313-macos	5m 52s
	3h 24m 22s

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