[issue37348] add _PyUnicode_FROM_ASCII macro

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

Should we make these APIs public?

* rename `_PyUnicode_FromASCII` to `PyUnicode_FromASCIIAndSize`.
* add `PyUnicode_FromASCII` as static inline function (without ABI).
* add `#define _PyUnicode_FromASCII PyUnicode_FromASCIIAndSize` for source code compatibility.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37348>
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