Tests

Add support for installing stubs from pylock files #22048

Job	Run time
Test mypyc suite with 32-bit Python	10m 20s
Type check our own code (py310-windows-64)	2m 9s
Test suite with py313-ubuntu, mypyc-compiled	15m 33s
Formatting and code style with Black + ruff	1m 56s
Parallel tests with py314-windows-64, interpreted	12m 9s
Test suite with py310-ubuntu, mypyc-compiled	17m 29s
Test suite with py311-ubuntu	9m 25s
Test suite with py314-ubuntu, mypyc-compiled	15m 16s
Test suite with py312-ubuntu	10m 7s
mypyc runtime tests with py310-ubuntu	6m 34s
Type check our own code (py310-ubuntu)	1m 3s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 14s
mypyc runtime tests with py313-macos	7m 35s
Test suite with py314-windows-64	31m 36s
Test suite with py314t-ubuntu, mypyc-compiled	17m 23s
Parallel tests with py314-ubuntu, interpreted	27m 24s
	3h 34m 13s

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