Feat/tournament sort (#7201)

* feat: implement Smooth Sort algorithm with detailed JavaDoc and test class

* style: format LEONARDO array for improved readability with clang-format

* feat(sorts): add TournamentSort (winner-tree)

* test: add unit test for null array handling in TournamentSort

---------

Co-authored-by: Ahmed Allam <60698204+AllamF5J@users.noreply.github.com>
Co-authored-by: Deniz Altunkapan <deniz.altunkapan@outlook.com>
Co-authored-by: Oleksandr Klymenko <19151554+alxkm@users.noreply.github.com>

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

@@ -0,0 +1,19 @@
+package com.thealgorithms.sorts;
+
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import org.junit.jupiter.api.Test;
+
+public class TournamentSortTest extends SortingAlgorithmTest {
+
+    @Test
+    void shouldAcceptWhenNullArrayIsPassed() {
+        Integer[] array = null;
+        assertNull(getSortAlgorithm().sort(array));
+    }
+
+    @Override
+    SortAlgorithm getSortAlgorithm() {
+        return new TournamentSort();
+    }
+}