refactor: cleanup StoogeSort (#5283)

* refactor: cleanup StoogeSort

* refactor: update DIRECTORY.md for StoogeSortTest

---------

Co-authored-by: Alex Klymenko <alx@alx.com>

src/test/java/com/thealgorithms/sorts/StoogeSortTest.java

@@ -0,0 +1,12 @@
+package com.thealgorithms.sorts;
+
+public class StoogeSortTest extends SortingAlgorithmTest {
+    protected int getGeneratedArraySize() {
+        return 1000;
+    }
+
+    @Override
+    SortAlgorithm getSortAlgorithm() {
+        return new StoogeSort();
+    }
+}