feat: implement Display for KeychainKind

Author: luisschwab

crates/wallet/src/types.rs

@@ -12,6 +12,7 @@
 use alloc::boxed::Box;
 use chain::{ChainPosition, ConfirmationBlockTime};
 use core::convert::AsRef;
+use core::fmt;
 
 use bitcoin::transaction::{OutPoint, Sequence, TxOut};
 use bitcoin::{psbt, Weight};
@@ -37,6 +38,15 @@ impl KeychainKind {
     }
 }
 
+impl fmt::Display for KeychainKind {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            KeychainKind::External => write!(f, "External"),
+            KeychainKind::Internal => write!(f, "Internal"),
+        }
+    }
+}
+
 impl AsRef<[u8]> for KeychainKind {
     fn as_ref(&self) -> &[u8] {
         match self {