feat: line selection highlighting

[rich-b]

Description

Adds selection highlight support to Line charts

Related Issue

374

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] I have signed the Adobe Open Source CLA.
• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
96.7% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[marshallpete]

Do you mind adding a story that demonstrates this feature?

[rich-b]

@marshallpete the existing story already demonstrates this. the ChartPopover -> LineChart story has a UNSAFE_highlightBy control. It can be set to item(default), series, or dimension. This is the same as what we already have for the ChartPopover -> StackedBarChart story