Function export_mdat_with_mimo_using 

pub fn export_mdat_with_mimo_using(
    run: &ExportRun<'_>,
    folder: &Path,
    mimo: Option<&MimoResponses>,
    spl_offset_db: Option<f64>,
    now_ms: i64,
    uuid: &mut dyn FnMut() -> Result<u128, ExportError>,
) -> Result<PathBuf, ExportError>

Writes the staged mdat using an injected UUID source.