Updated logger to properly format exceptions using processors

module/Common/src/Logger/Processor/ExceptionWithNewLineProcessor.php

@@ -0,0 +1,29 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Common\Logger\Processor;
+
+use const PHP_EOL;
+use function str_replace;
+use function strpos;
+
+final class ExceptionWithNewLineProcessor
+{
+    private const EXCEPTION_PLACEHOLDER = '{e}';
+
+    public function __invoke(array $record)
+    {
+        $message = $record['message'];
+        $messageHasExceptionPlaceholder = strpos($message, self::EXCEPTION_PLACEHOLDER) !== false;
+
+        if ($messageHasExceptionPlaceholder) {
+            $record['message'] = str_replace(
+                self::EXCEPTION_PLACEHOLDER,
+                PHP_EOL . self::EXCEPTION_PLACEHOLDER,
+                $message
+            );
+        }
+
+        return $record;
+    }
+}