[Feature] 如何才能进行飞线触发和监听结束？

### What problem does this feature solve?

飞线开始和结束，如何才能监听到？想做到的效果是，飞线结束后，创建新的飞线。不希望同一条飞线一直循环播放。

### What does the proposed API look like?

飞线效果是根据实时数据进行飞线触发的。

No files, tests, or entry points are named. First clarify the flyline lifecycle events and the intended API for real-time triggering and one-shot playback, then identify the relevant ECharts flyline implementation and tests. Done means a documented, tested way to observe start and end events and create a new flyline without looping.

Written by the indexing model from the issue text.