Add txid to `model::Attesttion` so we can easily access it

This makes it more comfortable to send `txid` to the UI.

daemon/src/model/cfd.rs

@@ -291,6 +291,7 @@ pub struct Attestation {
     #[serde(with = "::bdk::bitcoin::util::amount::serde::as_sat")]
     payout: Amount,
     price: u64,
+    txid: Txid,
 }
 
 impl Attestation {
@@ -307,6 +308,8 @@ impl Attestation {
             .find_map(|(_, cet)| cet.iter().find(|cet| cet.range.contains(&price)))
             .context("Unable to find attested price in any range")?;
 
+        let txid = cet.tx.txid();
+
         let payout = cet
             .tx
             .output
@@ -326,6 +329,7 @@ impl Attestation {
             price,
             scalars,
             payout,
+            txid,
         })
     }