Adding a built-in predicate hasLocalParent.

Author: PeterF778

consistent-sampling/src/main/java/io/opentelemetry/contrib/sampler/consistent56/Predicate.java

@@ -38,6 +38,17 @@ static Predicate isRootSpan() {
     };
   }
 
+  /*
+   * Return a Predicate that will only match Spans with local parent
+   */
+  static Predicate hasLocalParent() {
+    return (parentContext, name, spanKind, attributes, parentLinks) -> {
+      Span parentSpan = Span.fromContext(parentContext);
+      SpanContext parentSpanContext = parentSpan.getSpanContext();
+      return !parentSpanContext.isValid() || !parentSpanContext.isRemote();
+    };
+  }
+
   /*
    * Return a Predicate that matches all Spans
    */