[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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Non vengono indicati file, test o punti di ingresso. Inizia individuando l’implementazione di hovermode='x unified' e l’ordinamento della legenda del tooltip, quindi determina come ordinare dinamicamente i valori in ogni posizione x. Il lavoro è completato quando il tooltip riflette l’ordine crescente dei valori della legenda per il valore x su cui si passa il cursore, senza modificare le altre modalità di hover.