add argument to modify hover box position/direction

[celia-lm]

Right now developers can't modify the hover box position respective to the point the user is hovering. The hover box position is determined by:

• The numbers in the "transform=translate(valuex, valuey)" argument of the g element with className="hovertext": https://github.com/plotly/plotly.js/blob/master/src/components/fx/hover.js#L1200
• The shape specified in d in the path element (for the triangle orientation): make hover box caret/triangle optional #7278

Screen.Recording.2024-11-21.at.14.11.23.mov

Desired behavior:

• Some argument like dcc.Tooltip direction: https://dash.plotly.com/dash-core-components/tooltip#tooltip-properties
• It should also allow diagonal/combined positions ("bottom+right")

# the python way
fig.update_traces(hoverbox_direction="right")
fig.update_traces(hoverbox_direction="left+top")