Use Argument Clinic for more functions and methods

Many functions and methods implemented in C still parse their arguments with PyArg_ParseTuple() or PyArg_UnpackTuple().
They have no signature for introspection and use the slow METH_VARARGS calling convention.

There are 131 such PyMethodDef entries outside the test modules: _curses 25, _ctypes 16, _interpchannels 13 (GH-139141), time 11, _io 9, _tkinter 8, _thread 6, _csv 5, socket 3, sys 3, and 32 more in 27 files.

A few of them cannot be converted: the behaviour of socket.sendto(), socket.setsockopt() and socket.ioctl() depends on the number or the value of the arguments, and Argument Clinic rejects module-level __getattr__() as a special method.

I am going to submit a separate PR per module.

Linked PRs

• gh-155511
• gh-155512
• gh-155513
• gh-155514

Start by reviewing the remaining PyMethodDef entries in the listed modules, along with the Argument Clinic conventions already used in CPython. Exclude socket.sendto(), socket.setsockopt(), socket.ioctl(), and module-level getattr(); done means eligible functions and methods use Argument Clinic rather than the stated parsing and calling conventions.