improve map performance [CPP-916]

[adrian-kong]

https://docs.mapbox.com/help/troubleshooting/mapbox-gl-js-performance/

• disables sending metrics to mapbox
• enables optimize base styles
• enables attribute use desktop opengl
• half required points to draw ellipse (might be better to scale this w.r.t distance on map since small circles looks ok rendering ~ 8 points)

[swiftnav-travis]

Frontend and Release Workflow Started here

[swiftnav-travis]

Frontend and Release Workflow Started here

[pcrumley]

This a pretty difficult thing to review other than just a rubber stamp, but it looks fine?

marking as request changes because you need to update the documentation or undo a refactor

[pcrumley]

I kind of disagree with decision to remove the comments, i think putting it as an inline comment makes more sense but i don't think it should block merge.

[swiftnav-travis]

Frontend and Release Workflow Started here

[adrian-kong]

I kind of disagree with decision to remove the comments, i think putting it as an inline comment makes more sense but i don't think it should block merge.

think it might be changed in later PRs if the optimal # of points for zoom levels is figured out
but for now might just leave default 16 pts => 20 degrees