feat: metric range hover fixes

[madelineluke]

Description

The getVoronoiYEncoding helper function creates y encoding for voronoi points, so that the hoverable metric range points are included. This helper function needs to be used for the yEncoding prop when creating the hover area. The getVoronoiYEncoding function falls back to getLineYEncoding when there are no metric range hover points.

Related Issue

Motivation and Context

When using the metric range displayOnHover prop

How Has This Been Tested?

Visually and unit tests

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.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[github-actions]

🎨 Storybook -> https://opensource.adobe.com/react-spectrum-charts/PR-773

📚 Docs -> https://opensource.adobe.com/react-spectrum-charts/PR-773-docs/