Enhancement: start jetty with http2

Currently the jetty server uses http1.1

```
final ServerConnector sslConnector = new ServerConnector(server,
new SslConnectionFactory(sslContextFactory, "http/1.1"),
new HttpConnectionFactory(httpsConfig));
sslConnector.setPort(httpsPort);
sslConnector.setHost(bindInterface);
server.addConnector(sslConnector);
```

https://github.com/apache/cloudstack/blob/2e9b3d8e084b5f6ddf4690afe266e0a2b3f751bb/client/src/main/java/org/apache/cloudstack/ServerDaemon.java#L240

It would be nice to support http2
https://eclipse.dev/jetty/javadoc/jetty-9/org/eclipse/jetty/http2/server/HTTP2ServerConnectionFactory.html

##### ISSUE TYPE

* Enhancement Request

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##### CONFIGURATION

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##### ACTUAL RESULTS

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從 client/src/main/java/org/apache/cloudstack/ServerDaemon.java 約第 240 行開始，檢查現有的 HTTPS ServerConnector 設定。閱讀 Jetty 的 HTTP2ServerConnectionFactory 文件，以了解整合點。完成的標準是 CloudStack 的 Jetty 伺服器在維持目前 HTTP/1.1 行為的同時支援 HTTP/2，並建立預期的設定與驗證。

由索引模型根據 Issue 內容生成。