API: Add ListRule() for routing (#5569)

https://github.com/XTLS/Xray-core/pull/5569#issuecomment-3766310407

features/routing/router.go

@@ -16,6 +16,7 @@ type Router interface {
 	PickRoute(ctx Context) (Route, error)
 	AddRule(config *serial.TypedMessage, shouldAppend bool) error
 	RemoveRule(tag string) error
+	ListRule() []Route
 }
 
 // Route is the routing result of Router feature.
@@ -65,6 +66,11 @@ func (DefaultRouter) RemoveRule(tag string) error {
 	return common.ErrNoClue
 }
 
+// ListRule implements Router.
+func (DefaultRouter) ListRule() []Route {
+	return nil
+}
+
 // Start implements common.Runnable.
 func (DefaultRouter) Start() error {
 	return nil