sankey: test multi-dimensional (node|link).customdata in hovertemplate
sankey: test multi-dimensional (node|link).customdata in hovertemplate

aburato/plotly.js,aburato/plotly.js,plotly/plotly.js,plotly/plotly.js,etpinard/plotly.js,plotly/plotly.js,plotly/plotly.js,etpinard/plotly.js,etpinard/plotly.js