Add GaugeField component (circular progress indicator)

[pglevy]

Summary

Props

• value — numeric percentage (0–100)
• primaryText — icon or text displayed in the center of the gauge
• size — size variants (SMALL, STANDARD, LARGE)
• Standard field props: label, labelPosition, instructions, marginBelow

SAIL Reference

• https://docs.appian.com/suite/help/25.3/Gauge_Field.html

Notes

• Should use SVG or a CSS-based circular progress approach
• Center text/icon should scale with size variant