Implement new deprecated warnings

experimental/deprecated/manager.go

@@ -2,6 +2,7 @@ package deprecated
 
 import (
 	"context"
+	"runtime/debug"
 
 	"github.com/sagernet/sing/service"
 )
@@ -13,6 +14,7 @@ type Manager interface {
 func Report(ctx context.Context, feature Note) {
 	manager := service.FromContext[Manager](ctx)
 	if manager == nil {
+		debug.PrintStack()
 		return
 	}
 	manager.ReportDeprecated(feature)