Add PyLong_IsPositive/Zero/Negative() functions

[skirpichev]

as alternative API to PyLong_GetSign().

It seems, C-API WG is positive on this, see capi-workgroup/decisions#29. This issue will track implementation.

Linked PRs

• gh-126061: Add PyLong_IsPositive/Zero/Negative() functions #126065
• gh-126061: add PyLong_IsPositive/Negative/Zero/GetSign functions to refcounts.dat #126788

[rruuaanng]

If possible, could you give it to me?

[skirpichev]

In principle, I've patch ready. But please do! Only set pr as draft until C-API WG issue is open.

[rruuaanng]

Oh thank you, Sergey!