Added token for multiline line height in type ramp

[bheston]

Pull Request

Description

Updated the type ramp to support differentiation between single line and multiline usage, where multiline typically needs a larger line height for readability.

• Added tokens for multiline line height for each position in the ramp
• Refactored the interface for passing all the size and height values
• Added a new global style for multiline text
• Added to the Adaptive UI Explorer

Test Plan

Tested in Adaptive UI Explorer

Checklist

General

• I have included a change request file using $ npm run change
• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation for this project.

⏭ Next Steps

Update the Type Scale generator to allow for an easing function for line heights. It's common that smaller font sizes need more line height but larger sizes like for headings do not.