Adding new `ReflectionConstant::getFileName()`

Dear Internals, Last week I sent a patch[1] to address a feature request[2] for a way to identify at runtime what file a constant was declared in. Since this adds the filename (a zend_string) to every zend_constant instance, it is not the most trivial of changes. It was suggested[3] by iluuu1994 that this may qualify as a small change that can be merged without an RFC, if there are no objections on the mailing list. So, are there any objections? I'll note that the ReflectionConstant class was added[4] as part of PHP 8.4, so it would be great if this new method could also be included as part of the 8.4 release. Thanks, --Daniel Scherzer (https://github.com/DanielEScherzer) [1] https://github.com/php/php-src/pull/15847 [2] https://github.com/php/php-src/issues/15723 [3] https://github.com/php/php-src/pull/15847#issuecomment-2345774089 [4] https://github.com/php/php-src/pull/13669