updated pretty Display and added BSTRecursiveGenericTest.java

Author: Krishnan M

src/test/java/com/thealgorithms/datastructures/trees/BSTRecursiveGenericTest.java

@@ -3,6 +3,7 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+
 import java.util.List;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;