[Feature] Effect line color with visual map

### What problem does this feature solve?

I wanna use 3rd value for lines and use that value visual map and change the color of line that value.

I tried to create it but it just change the color of points. Is it possible to use visual map for the line?

Have a look the example

https://codepen.io/abdurrahmanyildirim/pen/bNVdrGP

I need something like that

3rd dimension will be color

### What does the proposed API look like?

Api can be same.