鼠标移动到pie状图时，鼠标无法变成小手

[love123724]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

有时候需要点击饼状图跳转某个页面，如果能变成小手能让用户体验更好

What does the proposed API look like?

new G2.Chart({
container: {string} | {HTMLDivElement},
cursor?:true
});

[ai-qing-hai]

chart
.interval()
.adjust('stack')
.position('value')
.color('type')
.style({
cursor:'pointer'
}); 在 style 上可以添加

[visiky]

两种方式:
1、直接在 style 中设置
2、鼠标也是一种交互: 自定义一个 interaction，事件触发为 element 的 mouseenter 或 mouseeleave，具体的交互反馈是鼠标的样式变化，伪代码如下:

registerInteraction('pie-cursor-interaction', {
  start: [
    { trigger: 'element:mouseenter', action: ['cursor:pointer'] },
  ],
  end: [
    { trigger: 'element:mouseleave', action: ['cursor:default'] },
  ]
})

chart.interaction('pie-cursor-interaction')