gh-108512: Add and use new replacements for PySys_GetObject() (alt) #129736
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Add functions PySys_GetAttr() and PySys_GetAttrString().
This is an alternative to #111035 which only adds functions that request optional attributes, renamed to
PySys_GetAttr()andPySys_GetAttrString(), to the public C API. Functions that raise RuntimeError for absent attributes are added as internal functions_PySys_GetRequiredAttr()and_PySys_GetRequiredAttrString().📚 Documentation preview 📚: https://cpython-previews--129736.org.readthedocs.build/