UtilityMethodTestCase: new usesPhp8NameTokens() method

In PHP 8.0 identifier name tokenization will change as outline in the [accepted RFC "Treat namespaced names as single token"](https://wiki.php.net/rfc/namespaced_names_as_token).

When the PHP 8.0 identifier name tokenization is used, the target token to find for some tests will need to be a different token - for instance: `T_STRING` vs `T_FULLY_QUALIFIED_NAME` -.
Along the same lines, the expected token positions in the return value of various functions will also be different when the PHP < 8.0 tokenization is used as certain tokens will be "squashed" into one token.

This adds a test helper method to allow tests to "know" whether or not to expect the PHP 8.0 identifier name tokenization, so the test setup/expectations can be adjusted based on the expected tokenization.

The method is based on the _current reality_.
At this time the PHP 8 tokenization should be expected on all PHPCS versions when run on PHP 8.

Refs:
* https://wiki.php.net/rfc/namespaced_names_as_token
* [Proposal for handling this PHP 8 change in PHPCS](squizlabs/PHP_CodeSniffer#3041)
* [Open PR for the PHPCS 3.x branch to "undo" the PHP 8 tokenization](squizlabs/PHP_CodeSniffer#3063)

PHPCSUtils/TestUtils/UtilityMethodTestCase.php

@@ -311,6 +311,27 @@ public static function resetTestFile()
         self::$phpcsFile = null;
     }
 
+    /**
+     * Check whether or not the PHP 8.0 identifier name tokens will be in use.
+     *
+     * The expected token positions/token counts for certain tokens will differ depending
+     * on whether the PHP 8.0 identifier name tokenization is used or the PHP < 8.0
+     * identifier name tokenization.
+     *
+     * Tests can use this method to determine which flavour of tokenization to expect and
+     * to set test expectations accordingly.
+     *
+     * @codeCoverageIgnore Nothing to test.
+     *
+     * @since 1.0.0
+     *
+     * @return bool
+     */
+    public static function usesPhp8NameTokens()
+    {
+        return \version_compare(\PHP_VERSION_ID, '80000', '>=') === true;
+    }
+
     /**
      * Get the token pointer for a target token based on a specific comment.
      *