Tests

Add support for installing stubs from pylock files #22047

Job	Run time
mypyc runtime tests with py313-macos	4m 31s
Test mypyc suite with 32-bit Python	4m 27s
Parallel tests with py314-windows-64, interpreted	4m 18s
mypyc runtime tests with py310-ubuntu	4m 26s
Test suite with py310-ubuntu, mypyc-compiled	4m 27s
Parallel tests with py314-ubuntu, mypyc-compiled	4m 27s
Test suite with py314-windows-64	4m 20s
Test suite with py312-ubuntu	4m 27s
Formatting and code style with Black + ruff	1m 50s
Type check our own code (py310-ubuntu)	1m 8s
Test suite with py311-ubuntu	4m 27s
Test suite with py314-ubuntu, mypyc-compiled	4m 5s
Test suite with py313-ubuntu, mypyc-compiled	4m 24s
Test suite with py314t-ubuntu, mypyc-compiled	4m 26s
Parallel tests with py314-ubuntu, interpreted	4m 26s
Type check our own code (py310-windows-64)	1m 51s
	1h 2m 0s

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