Scattergl support

[konradsitarz]

Hey I need to plot more than 10000 points in scatter plot and it makes it unusable with current scatter.
I see that in anno.ts the plot type is 'scatter', does it make sens to replace it with scattergl? Can we add support for it?

If you have any other idea how to make it possible I would appreciate it, I was thinking about binning data but I'm not sure how to implement it to be able to see full resolution on zoom.

Thanks for writing this plugin I really appreciate all the work 🦾