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