Add Blazor support for Celsius and Fahrenheit number format units

[m-akinc]

Pull Request

🤨 Rationale

Part of #2016

👩‍💻 Implementation

Added Razor components for Celsius and Fahrenheit unit elements, plus a couple tests for each.

🧪 Testing

Added tests.

✅ Checklist

• [x] I have updated the project documentation to reflect my changes or determined no changes are needed.