Tests

Add proper lazy deserialization (#21198) #21629

Job	Run time
Test mypyc suite with 32-bit Python	10m 32s
mypyc runtime tests with py310-ubuntu	6m 37s
Test suite with py312-ubuntu	10m 6s
Test suite with py314-ubuntu, mypyc-compiled	15m 49s
Test suite with py314t-ubuntu, mypyc-compiled	20m 43s
Test suite with py310-ubuntu, mypyc-compiled	15m 53s
Parallel tests with py314-ubuntu, interpreted	23m 42s
Parallel tests with py314-windows-64, interpreted	10m 13s
mypyc runtime tests with py313-macos	5m 47s
Test suite with py314-windows-64	27m 38s
Test suite with py313-ubuntu, mypyc-compiled	15m 36s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 46s
Type check our own code (py310-windows-64)	2m 33s
Test suite with py311-ubuntu	9m 30s
Formatting and code style with Black + ruff	1m 51s
Type check our own code (py310-ubuntu)	1m 55s
	3h 26m 11s

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