[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.

Inizia esaminando il trace scatterternary esistente e la discussione nell’issue #1385, poiché l’issue non indica file sorgente né test. Il lavoro sarà considerato completato quando sarà definito e implementato il supporto scattergl per i ternary plots, con hovering, zoom e panoramica reattivi per i dataset più grandi descritti.