gh-126061: add PyLong_IsPositive/Negative/Zero/GetSign functions to refcounts.dat
#126788
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📚 Documentation preview 📚: https://cpython-previews--126788.org.readthedocs.build/
This PR completes the proposal in #126065, but it only adds GetSign/IsZero/IsPositive/IsNegative
Although it is a draft PR, it is open for review. For other recently added C-API, I need to spend a little time looking for them, if there are no such requirements, it can be merged directly.