Function connect

connect(options: {
host: string;
port: number;
}): Promise<TcpSocket>
通过Tcp连接到远程主机，并返回TcpSocket对象

Returns
Promise
Parameters
- options: {
  host: string;
  port: number;
  }
  - host: string
    
    远端主机名或IP
  - port: number
    
    连接端口
Returns Promise<TcpSocket>