Support markers on line traces (curve) as an option.

[suley1212]

Markers are currently supported as overlays from what I have seen in a user doc. The problem is enabling /disabling traces by clicking on legend means now there are 2 trace elements - a Curve and a Scatter so to enable and disable a single trace you have to click on 2 legends.

Is your feature request related to a problem? Please describe.

Yes, see above

Describe the solution you'd like

An option such as markers=True as available in plotly line plots would be useful for all plotting backends

Describe alternatives you've considered

Alternatives are lot of unneccessary coding for a common use case

Additional context

Add any other context or screenshots about the feature request here.