Tests

Add ast-serialize as an optional dependency (#21028) #21354

Job	Run time
Test mypyc suite with 32-bit Python	9m 14s
Test suite with py313-ubuntu, mypyc-compiled	14m 55s
Test suite with py311-ubuntu	8m 38s
Test suite with py314t-ubuntu, mypyc-compiled	18m 17s
Parallel tests with py314-ubuntu, interpreted	25m 9s
mypyc runtime tests with py313-macos	4m 40s
Test suite with py312-ubuntu	8m 54s
Test suite with py310-ubuntu, mypyc-compiled	15m 9s
Parallel tests with py314-windows-64, interpreted	10m 48s
Test suite with py314-ubuntu, mypyc-compiled	14m 23s
Formatting and code style with Black + ruff	2m 9s
mypyc runtime tests with py310-ubuntu	5m 57s
Type check our own code (py310-ubuntu)	1m 53s
Type check our own code (py310-windows-64)	2m 18s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 42s
Test suite with py314-windows-64	26m 29s
	3h 18m 35s

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