[Client] Add vtxo expiration details to balance & Fix coin selection

* add expiry details in balance command

* coin selection: sort vtxos by olderFirst

* rename type

* balance: add next expiration

* add next expiration in offchain_balance json

* print duration in nextExpiration

* fix dust coin selection

* refactor sort

client/signer.go

@@ -81,10 +81,7 @@ func signPset(
 		return err
 	}
 
-	_, liquidNet, err := getNetwork()
-	if err != nil {
-		return err
-	}
+	_, liquidNet := getNetwork()
 
 	prevoutsScripts := make([][]byte, 0)
 	prevoutsValues := make([][]byte, 0)