Function get_valuation_plate_stock_list 

pub async fn get_valuation_plate_stock_list(
    client: &Arc<FutuClient>,
    symbol: &str,
    valuation_type: Option<i32>,
    next_key: Option<&str>,
    num: Option<i32>,
    sort_type: Option<i32>,
    sort_id: Option<i32>,
    filter_security: Option<&str>,
) -> Result<String>