希望需求：动作列 buttons 添加 visible 属性

[zaxlct]

Please follow the issue template, or your issue may be closed automatically.

For bug report, provide the following section

buttons: [ 
    {
      handler?: (row) => void;   // 点击事件的 callback, 注意使用箭头函数，
      visible?: (row) => Boolean; // 类似 v-if 的功能
      label: String;             // 按钮的 label
    },
    ...
  ]

Online reproduce

It is important to provide an online sample to reproduce the issue.

• Template for reproducing front-end pagination issue
• Template for reproducing server-end pagination issue

Expected Behavior

Current Behavior

Steps to Reproduce

Detailed Description

For feature request, provide the following section

Motivation / Use Case

Expected Behavior

Other Information

[njleonzhang]

https://www.njleonzhang.com/vue-data-tables/#/zh-cn/actionCol?id=%E5%BF%AB%E9%80%9F%E7%94%9F%E6%88%90%E5%8A%A8%E4%BD%9C%E5%88%97

参照文档和例子，使用 props 属性可以实现。