Function append_region 

pub async fn append_region(
    file: PathBuf,
    sheet_name: String,
    region_id: Option<u32>,
    table_name: Option<String>,
    rows_ref: Option<String>,
    from_csv: Option<String>,
    header: bool,
    footer_policy: AppendRegionFooterPolicyArg,
    dry_run: bool,
    in_place: bool,
    output: Option<PathBuf>,
    force: bool,
) -> Result<Value>