[Lens] Axis color option

[ghudgins]

Describe the feature:
Provide color options for axis

Describe a specific use case for the feature:
When I have multiple axis
And I have a reference line bound to each axis
I need to match the axis to the threshold line color
So I can easily see which threshold belongs to which axis

2nd use case: also improve the integration on canvas where the background color is more likely to be something custom

Screenshot from related reference line issue

[elasticmachine]

Pinging @elastic/kibana-vis-editors (Team:VisEditors)

[flash1293]

Note: Changing the labels of the reference lines to be rendered like in the screenshot is not part of this issue, it’s just about the color

[ghudgins]

discussed today and we are not going to move forward with this issue in Lens. There are a few reasons for this:

• describing theme-aware (dark / light) colors is not possible (we do have this issue elsewhere) but would be difficult here as well
• TSVB wasn't a good experience from a color-selection perspective and led to visualizations that did not have optimal colors
• the mockup was put together without too much consideration
• most dashboards don't have axis colors (although we do see some on google image search)
• this case is rare
• can easily make bad looking dashboards
• we want to do this (and more) via canvas/presentation features aka "photoshop for datavis" in the future...this belongs more as a @elastic/kibana-presentation area issue / project