walletrpc: add ListLeases

lnwallet/interface.go

@@ -260,6 +260,9 @@ type WalletController interface {
 	// NOTE: This method requires the global coin selection lock to be held.
 	ReleaseOutput(id wtxmgr.LockID, op wire.OutPoint) error
 
+	// ListLeasedOutputs returns a list of all currently locked outputs.
+	ListLeasedOutputs() ([]*wtxmgr.LockedOutput, error)
+
 	// PublishTransaction performs cursory validation (dust checks, etc),
 	// then finally broadcasts the passed transaction to the Bitcoin network.
 	// If the transaction is rejected because it is conflicting with an