GetWebTerminal - 获取进入容器的链接

此次调用的请求 ID，用于诊断和答疑。

进入容器的链接。链接为 WebSocket URL。用户需构建 WebSocket 客户端。 客户端中关于 WebSocket 的通信格式可参考以下代码：

ws = new WebSocket(
    `wss://xxxxx`,
  );
  ws.onopen = function open() {
    console.warn('connected');
    term.write('\r');
  };

  ws.onclose = function close() {
    console.warn('disconnected');
    term.write('Connection closed');
  };

  // 收到后端返回
  ws.onmessage = function incoming(event) {
    const msg = JSON.parse(event.data);
    console.warn(msg);
    if (msg.operation === 'stdout') {
      term.write(msg.data);
    } else {
      console.warn('invalid msg operation: ' + msg);
    }
  };

  // 控制台输入
  term.onData(data => {
    const msg = { operation: 'stdin', data: data };
    ws.send(JSON.stringify(msg));
  });

  term.onResize(size => {
    const msg = { operation: 'resize', cols: size.cols, rows: size.rows };
    setTimeout(() => ws.send(JSON.stringify(msg)), 15000);
  });

  fitAddon.fit();
};