gh-91922: Fix sqlite connection on nonstardard locales and paths

[serhiy-storchaka]

• Fix function sqlite.connect() and the sqlite.Connection constructor
  on non-UTF-8 locales.
• Fix support of bytes paths non-decodable with the current FS encoding.

Closes #91922

[erlend-aasland]

Thanks, I'll review it tomorrow! From a quick glance, it seems like the main change is the PyOS_FSPath conversion, right?

[serhiy-storchaka]

No, the main change is calling PySys_Audit() before encoding the database path to char *.

PyOS_FSPath() is used instead of PyUnicode_FSConverter() in the module-level function to avoid unneeded encoding at that stage. In is not necessary change now (I thought it was necessary at the beginning of work on this issue).