Unable to decode serialized TxOut

从 src/transaction.rs 中的 TxOut 和 TxOutWitness 定义以及所引用行附近的序列化行为开始，然后使用提供的 transaction 和 round-trip 代码片段重现该问题。当序列化并反序列化后的 TxOut 保留其 rangeproof，从而使 unblind 成功时，即表示完成；如果 repository 提供了合适的位置，请添加或更新回归覆盖。

There is an issue in serialization of TxOut, we're unable to decode it after serialization.
The problem lyes in the simplicityhl::elements::encode::serialize.
For unblinding it misses Rangeproof inside. For some reason it isn't serialized inside.
TxOut contains TxOutSecrets inside https://github.com/ElementsProject/rust-elements/blob/2d94f5dcb5e4a81838681c71ed8a49b337feecd2/src/transaction.rs#L703, but TxOutWitness has its own serialization https://github.com/ElementsProject/rust-elements/blob/2d94f5dcb5e4a81838681c71ed8a49b337feecd2/src/transaction.rs#L653 while TxOut just truncates it https://github.com/ElementsProject/rust-elements/blob/2d94f5dcb5e4a81838681c71ed8a49b337feecd2/src/transaction.rs#L719.

Here is a quick code snippet to test it:

use std::time::Duration;
        use simplicityhl::elements::{ Transaction, TxOut,};
        use simplicityhl::elements::bitcoin::secp256k1;
        use simplicityhl::elements::encode;
        
        pub const PUBLIC_SECRET_BLINDER_KEY: [u8; 32] = [1; 32];
        let secret_key = SecretKey::from_slice(&PUBLIC_SECRET_BLINDER_KEY).unwrap();

        
        let tx_id = "8e12b0c994293d15b7f43abaeb6c119ce3612ff00246b7ae9079dca90a35031f";
        let url = format!("https://blockstream.info/liquidtestnet/api/tx/{}/hex", tx_id);
        let client = reqwest::blocking::Client::builder()
            .timeout(Duration::from_secs(10))
            .build()
            .unwrap();
        let tx_hex = client
            .get(&url)
            .send()
            .unwrap()
            .error_for_status()
            .unwrap()
            .text()
            .unwrap();
        
        let transaction: Transaction = encode::deserialize(&hex::decode(&tx_hex).unwrap()).unwrap();
        let tx_out_from_reqwest = transaction.output[0].clone();
        assert!(tx_out_from_reqwest.unblind(secp256k1::SECP256K1, secret_key).is_ok());
        
        let tx_out_from_request_serialized = encode::serialize(&tx_out_from_reqwest);
        let tx_out_from_request_deserialized: TxOut = encode::deserialize(&tx_out_from_request_serialized).unwrap();
        
        assert!(tx_out_from_request_deserialized.unblind(secp256k1::SECP256K1, secret_key).is_ok());