Color relief support and hillshading improvements. (#1371)

## Launch Checklist

This adds support for `relief-color` property so that it will create an
elevation expression when the button is pressed.
It also adds support for `colorArray` and `numberArray` types so that
the user would be able to add the relevant information.

Before:
<img width="403" height="324" alt="image"
src="https://github.com/user-attachments/assets/250abd81-6176-4711-a1ee-d33d443932d7"
/>

<img width="403" height="324" alt="image"
src="https://github.com/user-attachments/assets/6a1bb268-66db-42a1-97fc-33e5a40863b6"
/>


After:
<img width="403" height="324" alt="image"
src="https://github.com/user-attachments/assets/8ebaa1ea-4ef9-4aed-abcd-3c8b0057ea76"
/>

<img width="403" height="324" alt="image"
src="https://github.com/user-attachments/assets/e0728c92-85f9-4b86-8635-8877cf257b2f"
/>


 - [x] Briefly describe the changes in this PR.
- [x] Include before/after visuals or gifs if this PR includes visual
changes.
 - [x] Write tests for all new functionality.
 - [x] Add an entry to `CHANGELOG.md` under the `## main` section.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/components/PropertyGroup.tsx

@@ -26,13 +26,9 @@ function getFieldSpec(spec: any, layerType: LayerSpecification["type"], fieldNam
   return fieldSpec
 }
 
-function getGroupName(spec: any, layerType: LayerSpecification["type"], fieldName: string) {
-  const paint  = spec['paint_' + layerType] || {}
-  if (fieldName in paint) {
-    return 'paint'
-  } else {
-    return 'layout'
-  }
+function getGroupName(spec: any, layerType: LayerSpecification["type"], fieldName: string): 'paint' | 'layout' {
+  const paint = spec['paint_' + layerType] || {}
+  return (fieldName in paint) ? 'paint' : 'layout';
 }
 
 type PropertyGroupProps = {