[php-src] Issue #14423: Cache PCRE named group names

Issue: https://github.com/php/php-src/issues/14423 Author: mvorisek ### Description I have discovered PCRE preg_match is at least twice as slow when using named groups. PCRE internally remaps named groups to indexes, so the slowdown is comming from php-src. I belive the reason is the named group names zvals are created each time the preg_match is run. I propose to improve the performance by caching the names zvals in the regex cache entry - https://github.com/php/php-src/blob/php-8.3.7/ext/pcre/php_pcre.c#L55