[issue46541] Replace _Py_IDENTIFIER() with statically initialized objects.

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> `_Py_Identifier` has been useful but at this point there is a faster and simpler approach we could take as a replacement: statically initialize the objects as fields on `_PyRuntimeState` and reference them directly through a macro.

This change is going to break projects in the wild. Yes, people use the _Py_IDENTIFIER(), _PyUnicode_FromId() and other "Id" variant of many functions in 3rd party projects.

Is it possible to keep runtime initialization if this API is used by 3rd party code?

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<https://bugs.python.org/issue46541>
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