Implement the `old_sqlite_version` member variable in `SpatiaLiteDatabase` to be used in exposure-lib

The SQL function RETURNING requires a rather new version of SQLite. The old SpatialiteDatabase class in exposure-lib had a member old_sqlite_version to check for a sufficiently new version of SQLite and to provide a workaround if necessary.

\fyi @tara @shinde \rfc @laurens