Support `setCloudProxy()` on web

[sunweiyang]

We have an enterprise customer that requires Agora Cloud Proxy's Force UDP mode for the web browser version of our Flutter Agora app. It's currently not supported (see logs excerpt below). When will setCloudProxy() be supported? Or at the very least, is there a monkeypatch or workaround that we can do to enable this?

[3:07:41 PM:082][Iris log]:[callIrisApiAsync][start] {"event":"RtcEngine_setCloudProxy_39d115e","data":"{\"proxyType\":1}","data_size":15,"result":"","length":[],"buffer_count":0}
[3:07:41 PM:082][Iris warning]:RtcEngine_setCloudProxy_39d115e not supported in this platform!

[littleGnAl]

Thanks for your report, we will support it in the future.