[issue42064] Convert sqlite3 to multi-phase initialisation (PEP 489)

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland <erlend.aasland at innova.no> added the comment:

Instead of using a custom context struct for sqlite3_create_funcion_v2(), we may just use sqlite3_context_db_handle() to get `self`, and then fetch the state using PyType_GetModuleState(Py_TYPE(self)).

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<https://bugs.python.org/issue42064>
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