Tests

[mypyc] Document librt.time (#21372) #22033

Job	Run time
Test mypyc suite with 32-bit Python	10m 36s
Test suite with py311-ubuntu	9m 36s
Test suite with py310-ubuntu, mypyc-compiled	16m 21s
Test suite with py314-ubuntu, mypyc-compiled	16m 7s
mypyc runtime tests with py310-ubuntu	7m 5s
mypyc runtime tests with py313-macos	6m 12s
Formatting and code style with Black + ruff	1m 51s
Test suite with py314-windows-64	31m 45s
Type check our own code (py310-windows-64)	1m 49s
Parallel tests with py314-windows-64, interpreted	13m 19s
Test suite with py314t-ubuntu, mypyc-compiled	17m 55s
Test suite with py312-ubuntu	9m 39s
Test suite with py313-ubuntu, mypyc-compiled	16m 20s
Type check our own code (py310-ubuntu)	1m 8s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 36s
Parallel tests with py314-ubuntu, interpreted	24m 17s
	3h 31m 36s

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