[FEATURE]: Add scattergl trace for ternary plot

Hello,

Currently the Ternary Plot only supports scatterternary trace, I am developing an open source glass web database where ternary visualizations are very usefull. However, I can sense that there's a performace lag when I have more points to render.

This amount of data is fine and can be zoomed and panned without lag (around 300 points):

But with this, a bit lag while hovering and zooming (around 3000 points):

And below is of course very laggy (around 30000 points):

I found one comment https://github.com/plotly/plotly.js/issues/1385#issuecomment-1538310933 from an old issue asking the same thing. It seems that it is not so easy to implement. Despite this, I would like to open this new issue to continue the discussion.

Commencez par examiner le trace scatterternary existant et la discussion dans l’issue #1385, puisque l’issue ne nomme aucun fichier source ni test. Le travail sera considéré comme terminé lorsque la prise en charge de scattergl pour les ternary plots sera définie et implémentée, avec un survol, un zoom et un déplacement réactifs pour les jeux de données plus volumineux décrits.