Tests

Add support for installing stubs from pylock files #22044

Job	Run time
Test mypyc suite with 32-bit Python	52s
Test suite with py310-ubuntu, mypyc-compiled	1m 6s
Parallel tests with py314-windows-64, interpreted	55s
mypyc runtime tests with py313-macos	1m 7s
Test suite with py314-ubuntu, mypyc-compiled	1m 5s
Test suite with py314-windows-64	1m 2s
Type check our own code (py310-ubuntu)	1m 3s
mypyc runtime tests with py310-ubuntu	1m 5s
Test suite with py312-ubuntu	1m 5s
Formatting and code style with Black + ruff	1m 6s
Test suite with py311-ubuntu	1m 6s
Test suite with py314t-ubuntu, mypyc-compiled	1m 6s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 5s
Parallel tests with py314-ubuntu, interpreted	1m 6s
Type check our own code (py310-windows-64)	57s
Test suite with py313-ubuntu, mypyc-compiled	1m 6s
	16m 52s

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