[Feature] Cursor change option for Heatmaps

[amaresh494]

What problem does this feature solve?

Currently (v^5.4.1), the bar and line chart types have cursor change option. It would be really helpful to have cursor change option on the heatmap, and others.

What does the proposed API look like?

{
    type: 'heatmap' ,
    id ... ,
    name ... ,
    coordinateSystem: 'cartesian2d' ,
    xAxisIndex: 0 ,
    yAxisIndex: 0 ,
    geoIndex: 0 ,
    calendarIndex: 0 ,
    pointSize: 20 ,
    blurSize: 20 ,
    minOpacity: 0 ,
    maxOpacity: 1 ,
    cursor: 'pointer'
}