Tests

add support for `mypy.toml` and `.mypy.toml` configuration files #21314

Job	Run time
Test mypyc suite with 32-bit Python	9m 52s
Test suite with py312-ubuntu	9m 8s
Test suite with py310-ubuntu, mypyc-compiled	15m 22s
Formatting and code style with Black + ruff	1m 57s
Test suite with py313-ubuntu, mypyc-compiled	14m 8s
Test suite with py314-ubuntu, mypyc-compiled	14m 46s
Test suite with py314t-ubuntu, mypyc-compiled	17m 20s
Parallel tests with py314-ubuntu, interpreted	23m 49s
Test suite with py311-ubuntu	9m 12s
Type check our own code (py310-ubuntu)	1m 36s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 57s
mypyc runtime tests with py313-macos	4m 57s
Type check our own code (py310-windows-64)	2m 28s
Test suite with py314-windows-64	25m 43s
mypyc runtime tests with py310-ubuntu	6m 3s
Parallel tests with py314-windows-64, interpreted	11m 17s
	3h 15m 35s

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