Split hyperf/codec from hyperf/utils (#5660)

Co-authored-by: Deeka Wong <[email protected]>
Co-authored-by: 李铭昕 <[email protected]>

Author: huangdijia

tests/ClientTest.php

@@ -11,6 +11,7 @@
  */
 namespace HyperfTest\Testing;
 
+use Hyperf\Codec\Json;
 use Hyperf\Config\Config;
 use Hyperf\Context\ApplicationContext;
 use Hyperf\Contract\ConfigInterface;
@@ -30,7 +31,6 @@
 use Hyperf\Server\Event;
 use Hyperf\Server\Server;
 use Hyperf\Testing\Client;
-use Hyperf\Utils\Codec\Json;
 use Hyperf\Utils\Filesystem\Filesystem;
 use Hyperf\Utils\Serializer\SimpleNormalizer;
 use HyperfTest\Testing\Stub\Exception\Handler\FooExceptionHandler;