[FEATURE]: Add dynamic sorting of the tooltip legend ordering for hovermode='x unified' mode

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Description

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Please add dynamic sorting of the tooltip legend ordering for hovermode='x unified' mode, so that when the user move the mouse over the chart, the legend showing up in the tooltip block reflects the ascending order of the legend value for that specific x value.

Why should this feature be added?

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This will drastically improve the intuitiveness of the tooltip block information, making direct comparison between different trace at a certain x value much more easier.

Mocks/Designs

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Notes

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未指定文件、测试或入口点。首先定位 hovermode='x unified' 的实现及其 tooltip 图例排序，然后确定如何动态排序每个 x 位置的值。完成标准是：对于悬停的 x 值，tooltip 反映图例值的升序排列，同时不改变其他 hover 模式。