please add delete_item in workshop

[colining]

if you fail in update_item process first time. it's should be delete , and create item again

here is my code, I'm nod good at rust, so please check my code,and add this function

thanks a lot

    #[napi]
    pub async fn delete_item(item_id: BigInt) -> Result<(), Error> {
        let client = crate::client::get_client();
        let (tx, rx) = oneshot::channel();

        client
            .ugc()
            .delete_item(PublishedFileId(item_id.get_u64().1), |result| {
                tx.send(result).unwrap();
            });

        let result = rx.await.unwrap();
        match result {
            Ok(()) => Ok(()),
            Err(e) => Err(Error::from_reason(e.to_string())),
        }
    }

[LZQCN]

You can fork this project, add your code, and then submit a PR (Pull Request).