Fix for OXID 6.2 circular reference service problems

OXID eShop - getLogger fix OXID 6.2

# thx to alfred (https://github.com/alfredbez) for sharing
# add to modules/functions.php

use Monolog\Logger;
use Monolog\Handler\StreamHandler;
use OxidEsales\EshopCommunity\Internal\Container\ContainerFactory;
use Psr\Log\LoggerInterface;
use Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException;

function getLogger() {
  $loggerServiceName = LoggerInterface::class;
  try {
    $container = ContainerFactory::getInstance()->getContainer();

    return $container->get($loggerServiceName);
  } catch (ServiceCircularReferenceException $exception) {
    if (strpos($exception->getMessage(), $loggerServiceName) !== false) {
      $logger = new Logger('OXID Logger');
      $logger->pushHandler(new StreamHandler(OX_LOG_FILE, Logger::ERROR));

      $logger->critical('Not able to load logger from container');

      return $logger;
    }

    throw $exception;
  }
}

@proudcommerce & @suabo FYI: There is also an open Pull-Request to fix this directly in the core: OXID-eSales/oxideshop_ce#810