Support typed websocket

[jxnu-liguobin]

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类型化ws指的是将ws协议的传输媒介由目前的text改成 frame+case class json，涉及到解码器和akka ws相关的修改：

1. WsApi.scala
2. WsEndpoint.scala
3. wsService.scala#openConnection
4. 可能涉及到前端的修改：如websocket.js
5. 支持完typed，WsMessageForwardBehavior就可以去掉转发消息TransmitMessageProxy，不再需要手动decode。直接使用case class的即可。

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