Function preview_extract_module 

pub fn preview_extract_module(
    catalog: &OntologyCatalog,
    entity_iris: &[String],
    output_file: &Path,
    leave_stub: bool,
    locality: bool,
    document_overrides: &HashMap<PathBuf, String>,
    workspace_roots: &[PathBuf],
) -> Result<RefactorPlan>