Add named constructor to create CachedArrayKeywords::withDefaultKeywords

Allows end-users to create an instance with the i18n file provided by
us, without an external dependency on the path to the file.

Co-authored-by: Carlos Granados <barel.barelon@gmail.com>

Author: acoulton

src/Behat/Gherkin/Keywords/CachedArrayKeywords.php

@@ -19,15 +19,18 @@
  */
 class CachedArrayKeywords extends ArrayKeywords
 {
-    private const I18N_FILE_LOCATION = __DIR__ . '/../../../../i18n.php';
+    public static function withDefaultKeywords(): self
+    {
+        return new self(__DIR__ . '/../../../../i18n.php');
+    }
 
     /**
      * Initializes holder with file.
      *
      * @param string $file Cached array path
      */
-    public function __construct($file = null)
+    public function __construct($file)
     {
-        parent::__construct(require $file ?? self::I18N_FILE_LOCATION);
+        parent::__construct(require $file);
     }
 }

tests/Behat/Gherkin/Keywords/CachedArrayKeywordsTest.php

@@ -18,7 +18,7 @@ class CachedArrayKeywordsTest extends KeywordsTestCase
     protected function getKeywords()
     {
         // Test with the default i18n file provided in this repository
-        return new CachedArrayKeywords();
+        return CachedArrayKeywords::withDefaultKeywords();
     }
 
     protected function getKeywordsArray()