Adds positional and kwarg only symbols into generated stubs #16551

Job	Run time
Test mypyc suite with 32-bit Python	9m 6s
Test suite with py39-ubuntu, mypyc-compiled	14m 43s
Test suite with py39-windows-64	23m 0s
Test suite with py310-ubuntu	12m 13s
Test suite with py311-ubuntu	9m 23s
Test suite with py314-dev-ubuntu	17m 19s
Test suite with py313-ubuntu, mypyc-compiled	14m 17s
Type check our own code (py39-ubuntu)	1m 54s
mypyc runtime tests with py39-macos	4m 41s
Type check our own code (py39-windows-64)	2m 22s
Test suite with py312-ubuntu, mypyc-compiled	13m 28s
Formatting and code style with Black + ruff	1m 46s
	2h 4m 12s

Provide feedback