Add ability to jump to a slow widget

If we could get the widget creation location for a timeline event with Track Widget Builds enabled, we could do something like this. Similarly for the track layouts and paints options, if we could get the creation location of the render object (or better yet the associated widget), we could do this for those options too.

@dnfield is something like this possible?

首先检查启用 Track Widget Builds 时如何处理时间线事件，然后比较 track layouts 和 paints 选项。当用户可以从缓慢的 widget 或 render-object 事件跳转到其创建位置（理想情况下通过关联的 widget）时，即视为完成。

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