[php-src] Issue #11075: fpm: Show pool configuration file name in phpinfo()

Issue: https://github.com/php/php-src/issues/11075 Author: stollr ### Description If PHP is running per FPM several settings can be overwritten in the pool config file. For example ``` [www] php_admin_value[memory_limit] = 512M ``` In complex architectures this sometimes make it harder to find in which file the configuration comes from. The phpinfo() function lists all .ini files that were loaded. It would be nice if the fpm and the pool configuration file could be listed in the *phpinfo*, too. Maybe somewhere below the php-fpm paragraph. **Alternative** Even better would be to show from which file each settings comes from. For example like this:  But this may be a little overkill ^^