Tests

Split type-checking into interface and implementation in parallel workers #21640

Job	Run time
Test mypyc suite with 32-bit Python	9m 59s
Test suite with py310-ubuntu, mypyc-compiled	15m 51s
Test suite with py314-windows-64	27m 55s
Test suite with py314t-ubuntu, mypyc-compiled	20m 5s
Test suite with py314-ubuntu, mypyc-compiled	15m 17s
Parallel tests with py314-windows-64, interpreted	10m 9s
Test suite with py313-ubuntu, mypyc-compiled	15m 31s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 34s
mypyc runtime tests with py310-ubuntu	6m 17s
Test suite with py311-ubuntu	8m 45s
Parallel tests with py314-ubuntu, interpreted	26m 6s
Test suite with py312-ubuntu	9m 12s
mypyc runtime tests with py313-macos	4m 36s
Type check our own code (py310-ubuntu)	1m 51s
Type check our own code (py310-windows-64)	2m 53s
Formatting and code style with Black + ruff	1m 56s
	3h 22m 57s

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