[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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No se nombran archivos, pruebas ni puntos de entrada. Empieza localizando la implementación de hovermode='x unified' y el orden de la leyenda del tooltip; después, determina cómo se pueden ordenar dinámicamente los valores en cada posición x. Se considera terminado cuando el tooltip refleja el orden ascendente de los valores de la leyenda para el valor x sobre el que se está pasando el cursor, sin cambiar otros modos de hover.