Make the Py_tracefunc parameters optional
#1692
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The
PyEval_SetProfile/SetTracemethods support receivingNULLfor thePy_tracefuncparameter, in order to disable profiling/tracing. However, the only way to safely passNULLas a function pointer in Rust is by wrapping it in anOption<>.This PR updates the respective functions to make it easier for developers to disable profiling/tracing hooks, without having to resort to
transmuteorzeroed.