feat: AVLTreeNode 클래스 작성

yoonexample/src/main/java/search/binarysearchtree/AVLTreeNode.java

@@ -0,0 +1,10 @@
+package search.binarysearchtree;
+
+import java.util.Comparator;
+
+public class AVLTreeNode<E> extends LinkedBinarySearchTreeNode<E> {
+
+  public AVLTreeNode(E data, Comparator<E> comparator) {
+    super(data, comparator);
+  }
+}