User configurable scale color for Kibana maps

[A-Hall]

Describe the feature:

Allow the maps scale color to be user configurable.

Describe a specific use case for the feature:

In certain situations it is very hard to see the scale graphic in the lower left side of a map, such as when the scale appears over a wooded area:

[elasticmachine]

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

[nickpeihl]

I wonder if this should include changing the color for the mouse coordinates and attribution overlays as well? We should probably make it consistent.

[nreese]

I wonder if this should include changing the color for the mouse coordinates and attribution overlays as well? We should probably make it consistent.

And attribution as well

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[nreese]

@jsanz suggested adding a halo or colored background to avoid another setting/difficulties with dark/light mode.