[issue35370] Add _PyEval_SetTrace(tstate, func, arg) function

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> PyEval_SetTrace() and PyEval_SetProfile() function have no return value but can raise an exception. I'm not comfortable about these functions. Maybe one option would be to call PyErr_WriteUnraisable() on PySys_Audit() error. It might be better than "leaking" an exception which is unexpected to PyEval_SetTrace() and PyEval_SetProfile() callers.

I wrote PR 18977 to implement this idea.

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<https://bugs.python.org/issue35370>
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