[Feature Request] 📈 折线图在动态数据下的动画效果优化

# 竞品对比

- G2 折线图动画直接是对 path 做插值，导致效果比较诡异。虽然可以关闭 animation 达到向左侧偏移的效果，但动画又比较生硬。
- ECharts 和 HighCharts 的实时动画就比较自然，希望能对齐。

| 图表库 | 动画效果 |
|----|----|
| [G2Plot](https://g2plot.antv.antgroup.com/) | [https://g2plot.antv.antgroup.com/examples/dynamic-plots/basic/#dynamic-spline](https://g2plot.antv.antgroup.com/examples/dynamic-plots/basic/#dynamic-spline)

开启动画效果:  关闭动画效果 (设置 `animation: false`):  |
| [ECharts](https://echarts.apache.org/) | [https://echarts.apache.org/examples/zh/editor.html?c=dynamic-data2](https://echarts.apache.org/examples/zh/editor.html?c=dynamic-data2)  |
| [HighCharts](https://www.highcharts.com/) | [https://www.highcharts.com/demo/dynamic-update](https://www.highcharts.com/demo/dynamic-update)  |

Start by reproducing the dynamic line-chart behavior shown in the G2Plot dynamic-spline example, comparing animation enabled with animation: false. Review the linked ECharts dynamic-data2 and HighCharts dynamic-update examples for the target behavior. Done means dynamic line-chart updates animate naturally rather than interpolating the path in a jarring way.

Written by the indexing model from the issue text.