Tests

Add support for installing stubs from pylock files #22038

Job	Run time
Test suite with py314t-ubuntu, mypyc-compiled	18m 28s
Parallel tests with py314-windows-64, interpreted	13m 39s
Test suite with py311-ubuntu	9m 41s
Test suite with py310-ubuntu, mypyc-compiled	16m 11s
Test mypyc suite with 32-bit Python	10m 17s
Test suite with py314-ubuntu, mypyc-compiled	16m 51s
Test suite with py313-ubuntu, mypyc-compiled	15m 32s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 32s
Type check our own code (py310-ubuntu)	1m 6s
mypyc runtime tests with py310-ubuntu	6m 41s
Parallel tests with py314-ubuntu, interpreted	24m 50s
Type check our own code (py310-windows-64)	2m 30s
mypyc runtime tests with py313-macos	6m 18s
Test suite with py314-windows-64	31m 58s
Test suite with py312-ubuntu	9m 52s
Formatting and code style with Black + ruff	1m 50s
	3h 34m 16s

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