Tests

Split type-checking into interface and implementation in parallel wor… #21701

Job	Run time
Test mypyc suite with 32-bit Python	10m 43s
mypyc runtime tests with py310-ubuntu	6m 46s
Test suite with py310-ubuntu, mypyc-compiled	16m 4s
Test suite with py314-ubuntu, mypyc-compiled	14m 50s
Test suite with py314-windows-64	27m 37s
Test suite with py311-ubuntu	8m 59s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 27s
Test suite with py314t-ubuntu, mypyc-compiled	18m 3s
Type check our own code (py310-windows-64)	2m 29s
Test suite with py312-ubuntu	9m 39s
Type check our own code (py310-ubuntu)	1m 36s
Test suite with py313-ubuntu, mypyc-compiled	15m 2s
Formatting and code style with Black + ruff	1m 56s
Parallel tests with py314-ubuntu, interpreted	23m 52s
mypyc runtime tests with py313-macos	7m 2s
Parallel tests with py314-windows-64, interpreted	8m 2s
	3h 20m 7s

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