对连接桩实例添加port支持hide和show的方法

[hero8080]

功能描述

对一些算法的输入输出，采用的是连接桩实现的可视化，选择一个节点，显示当前节点的输入参数（left的连接桩），和输出参数（right的连接桩），对连接桩的显示和隐藏有需求，port貌似不能隐藏，通过viiable和display仅仅是在样式上隐藏了，实际上位置没有变化，

期望解决方案

node.hidePort(portID)
node.showPort(portID)

[x6-bot]

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