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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##### CLOUDSTACK VERSION

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##### CONFIGURATION

##### OS / ENVIRONMENT

##### SUMMARY

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##### EXPECTED RESULTS

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##### ACTUAL RESULTS

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Comece por client/src/main/java/org/apache/cloudstack/ServerDaemon.java, por volta da linha 240, e revise a configuração existente de HTTPS ServerConnector. Leia a documentação do Jetty sobre HTTP2ServerConnectionFactory para entender os pontos de integração. Está concluído quando o servidor Jetty do CloudStack oferecer suporte a HTTP/2 além do comportamento atual de HTTP/1.1, com a configuração e a validação pretendidas estabelecidas.

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