PHP 8.0 | Tokens: add new T_TYPE_UNION token

... which will indicate the `|` character in PHP 8.0 union types.

Author: jrfnl

src/Util/Tokens.php

@@ -75,6 +75,7 @@
 define('T_ZSR', 'PHPCS_T_ZSR');
 define('T_ZSR_EQUAL', 'PHPCS_T_ZSR_EQUAL');
 define('T_FN_ARROW', 'T_FN_ARROW');
+define('T_TYPE_UNION', 'T_TYPE_UNION');
 
 // Some PHP 5.5 tokens, replicated for lower versions.
 if (defined('T_FINALLY') === false) {