Add recursive factorial implementation with tests (#7178)

* Add recursive factorial implementation with tests

* [STYLE] Apply clang-format

* Move recursive factorial to recursion package and remove duplicate

* Move recursive factorial to recursion package and remove duplicate

* Apply clang-format to factorial recursion tests

* Apply clang-format to factorial recursion tests

---------

Co-authored-by: Koushik Sai <nyamathabadkoushik@gmail.com>
Co-authored-by: Deniz Altunkapan <deniz.altunkapan@outlook.com>

src/main/java/com/thealgorithms/recursion/FactorialRecursion.java

@@ -1,4 +1,4 @@
-package com.thealgorithms.maths;
+package com.thealgorithms.recursion;
 
 public final class FactorialRecursion {
     private FactorialRecursion() {

src/test/java/com/thealgorithms/recursion/FactorialRecursionTest.java

@@ -1,4 +1,4 @@
-package com.thealgorithms.maths;
+package com.thealgorithms.recursion;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;