Add new SQS queue suffix option (laravel#5252)

As described in laravel/framework#31784, this option will allow to
define a queue name suffix.

config/queue.php

@@ -55,6 +55,7 @@
             'secret' => env('AWS_SECRET_ACCESS_KEY'),
             'prefix' => env('SQS_PREFIX', 'https://sqs.us-east-1.amazonaws.com/your-account-id'),
             'queue' => env('SQS_QUEUE', 'your-queue-name'),
+            'suffix' => env('SQS_SUFFIX'),
             'region' => env('AWS_DEFAULT_REGION', 'us-east-1'),
         ],