[Feature] CirclePacking need in top deep after click show.

[LonelySnowman]

What problem does this feature solve?

气泡图点击放大的交互，其他气泡缩小的时候会遮罩在放大图上方，肉眼看上去会有闪烁的感觉，体验较差。

What does the proposed API look like?

气泡图点击放大时，置于最上方的图层。

https://visactor.io/vchart/demo/circle-packing-chart/bubble-circle-packing