Add "named" actor interface

actor.go

@@ -29,6 +29,14 @@ type Actor interface {
 	Type() string
 }
 
+// Named is any object with a name.
+type Named() string {
+	// Name returns the name. This doesn't need to be the same as Type. It
+	// must return the same string every time. It is used to differentiate
+	// actors of the same type in logs.
+	Name() string
+}
+
 // FlagAdder is any object that can add [Flag]s to a [FlagSet]. Actors which
 // implement this interface will be called upon to add flags during and only
 // during the flag parsing phase.