Insights: click to turn on/off a line series

Created by: Joelkw

Needs design.

Motivated by capture groups insights but should apply to all insights.

Provide a way to turn on/off lines on a graph to dig in further.

The y-axis should update to adjust to the remaining lines (so if you remove a big high-count line, the y-axis might shrink to make it easier to see the others).