Adding `Py_HashBuffer` to the Stable ABI

Feature or enhancement

Proposal:

The function Py_HashBuffer was added in PR: https://github.com/python/cpython/issues/122854

This was included in Python 3.14

Would like to propose adding this to the Stable ABI

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

This came up in discussion in the PR, but hadn't been done there as it wasn't determined previously. So would like to open this discussion

首先閱讀 PR #122854 以及 issue 中關於 Py_HashBuffer 和 Stable ABI 的討論。找出現有的 Stable ABI 入口點，以及類似函式所使用的驗證方式；當 Py_HashBuffer 被一致地納入且相關檢查通過時，即表示完成。