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

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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title: Provide API to set the tracing function to be used for running threads. -> Add _PyEval_SetTrace(tstate, func, arg) function
versions: +Python 3.9 -Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35370>
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