Improving BitonicSort (#5244)

* Improving BitonicSort

* Moving max method to SortingUtils

* Adding Javadoc to merge method

* Fix for test and code improvements

* Improving code readability

* Renaming method parameters

---------

Co-authored-by: alx <alx@alx.com>
Co-authored-by: vil02 <65706193+vil02@users.noreply.github.com>

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

@@ -0,0 +1,8 @@
+package com.thealgorithms.sorts;
+
+public class BitonicSortTest extends SortingAlgorithmTest {
+    @Override
+    SortAlgorithm getSortAlgorithm() {
+        return new BitonicSort();
+    }
+}