feat: add transactions method on wallet

bdk-ffi/src/bdk.udl

@@ -109,6 +109,8 @@ interface Wallet {
   boolean sign(PartiallySignedTransaction psbt);
 
   SentAndReceivedValues sent_and_received([ByRef] Transaction tx);
+
+  sequence<Transaction> transactions();
 };
 
 interface Update {};

bdk-ffi/src/wallet.rs

@@ -99,6 +99,13 @@ impl Wallet {
         let (sent, received): (u64, u64) = self.get_wallet().sent_and_received(&tx.clone().into());
         SentAndReceivedValues { sent, received }
     }
+
+    pub fn transactions(&self) -> Vec<Arc<Transaction>> {
+        self.get_wallet()
+            .transactions()
+            .map(|tx| Arc::new(tx.tx_node.tx.clone().into()))
+            .collect()
+    }
 }
 
 pub struct SentAndReceivedValues {