Add back original subsegment noOp method (#359)

Author: willarmiros

aws-xray-recorder-sdk-core/src/main/java/com/amazonaws/xray/entities/Subsegment.java

@@ -21,6 +21,10 @@
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public interface Subsegment extends Entity {
+    static Subsegment noOp(AWSXRayRecorder recorder) {
+        return new NoOpSubSegment(Segment.noOp(TraceID.invalid(), recorder), recorder);
+    }
+    
     static Subsegment noOp(AWSXRayRecorder recorder, boolean shouldPropagate) {
         return new NoOpSubSegment(Segment.noOp(TraceID.invalid(), recorder), recorder, shouldPropagate);
     }