Function download_season 

pub async fn download_season(
    db: State<'_, DatabaseWrapper>,
    season_id: String,
    series_name: String,
    season_name: String,
    season_number: i32,
    user_id: String,
    base_path: String,
    quality_preset: Option<String>,
) -> Result<Vec<i64>, String>

Queue all episodes of a specific season for download