Adding Asymptote (and MetaPost) vector graphics languages

[vibrog]

Since Vega charting are included, maybe Asymptote might be considered as well?

• Asymptote https://asymptote.sourceforge.io/
• MetaPost https://www.tug.org/metapost.html

Maybe even

• Gnuplot http://www.gnuplot.info/

[ggrossetie]

These are interesting options, but it is difficult/unsafe to allow this type of diagrams since they generally enable the execution of arbitrary code.

We have a dedicated issue for gnuplot: #53
From what I saw, it was complicated to guarantee a safe execution of gnuplot. I'm not familiar with asymptote but it seems that it can execute arbitrary and potentially malicious code.