Add color picker for legend item

[markov00]

Is your feature request related to a problem? Please describe.
Add a color picker to choose a new series color when clicking on the legend item.

Describe the solution you'd like
Will use EUIColorPicker

Describe alternatives you've considered

Additional context

Kibana Cross Issues
elastic/kibana#28618
elastic/kibana#19341

Checklist

• this request is checked against already exist requests
• every related Kibana issue is listed under Kibana Cross Issues list
• kibana cross issue tag is associated to the issue if any kibana cross issue is present

[markov00]

🎉 This issue has been resolved in version 2.1.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

Your semantic-release bot 📦🚀

[nickofthyme]

@markov00 & @rshen91 Do you think we could just require a React component, i.e. EuiColorPicker, to render allow this? I think it would look bad if the charts had a different color picker.

[rshen91]

@markov00 & @rshen91 Do you think we could just require a React component, i.e. EuiColorPicker, to render allow this? I think it would look bad if the charts had a different color picker.

I don't have a problem with this, and keeping the color pickers consistent makes sense to me. It looks like it already is a11y friendly so that's a plus elastic/eui#789