Support service register for rpc-multiplex. (#3941)

* 支持 rpc-multiplex 注册到服务中心

* 支持 rpc-multiplex 注册到服务中心，增加监控检查支持

* Support service register for `rpc-multiplex`.

Co-authored-by: 李铭昕 <715557344@qq.com>

Author: huangdijia

src/Listener/RegisterServiceListener.php

@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * This file is part of Hyperf.
+ *
+ * @link     https://www.hyperf.io
+ * @document https://hyperf.wiki
+ * @contact  group@hyperf.io
+ * @license  https://github.com/hyperf/hyperf/blob/master/LICENSE
+ */
+namespace Hyperf\RpcMultiplex\Listener;
+
+use Hyperf\Event\Contract\ListenerInterface;
+use Hyperf\RpcMultiplex\Constant;
+use Hyperf\RpcServer\Event\AfterPathRegister;
+use Hyperf\ServiceGovernance\ServiceManager;
+
+class RegisterServiceListener implements ListenerInterface
+{
+    /**
+     * @var ServiceManager
+     */
+    private $serviceManager;
+
+    public function __construct(ServiceManager $serviceManager)
+    {
+        $this->serviceManager = $serviceManager;
+    }
+
+    public function listen(): array
+    {
+        return [
+            AfterPathRegister::class,
+        ];
+    }
+
+    /**
+     * All official rpc protocols should register in here,
+     * and the others non-official protocols should register in their own component via listener.
+     *
+     * @param AfterPathRegister $event
+     */
+    public function process(object $event)
+    {
+        $annotation = $event->annotation;
+        if (! in_array($annotation->protocol, $this->getProtocols(), true)) {
+            return;
+        }
+        $metadata = $event->toArray();
+        $annotationArray = $metadata['annotation'];
+        unset($metadata['path'], $metadata['annotation'], $annotationArray['name']);
+        $this->serviceManager->register($annotation->name, $event->path, array_merge($metadata, $annotationArray));
+    }
+
+    protected function getProtocols(): array
+    {
+        return [
+            Constant::PROTOCOL_DEFAULT,
+        ];
+    }
+}