[Maps] allow users to configure font for text labels

[nreese]

Feature request from #52957 (comment)

It's quite typical for users to also want to change the font. Since the most common scenario is to use Maps with EMS basemaps this would not be a high priority to me at this moment since most of the visualization is already "defined" in cartographic terms, and a good default font already used in the basemap should be enough. But with custom basemaps also available, other fonts would be better suited, so we may need also that setting to be offered.

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[nickpeihl]

tiny-sdf might be useful here. AFAICT, it uses fonts available in the browser to create glyphs that can be used in webgl.

[nreese]

Closing, no up votes or user requests at the moment.