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/_SpecProperty.tsx

@@ -7,14 +7,15 @@ import labelFromFieldName from '../libs/label-from-field-name'
 
 
 type SpecPropertyProps = FieldSpecProps & {
-  onZoomClick(...args: unknown[]): unknown
-  onDataClick(...args: unknown[]): unknown
   fieldName?: string
   fieldType?: string
   fieldSpec?: any
   value?: any
   errors?: {[key: string]: {message: string}}
-  onExpressionClick?(...args: unknown[]): unknown
+  onZoomClick(): void
+  onDataClick(): void
+  onExpressionClick?(): void
+  onElevationClick?(): void
 };
 
 
@@ -31,6 +32,7 @@ export default class SpecProperty extends React.Component<SpecPropertyProps> {
       onZoomClick={this.props.onZoomClick}
       onDataClick={this.props.onDataClick}
       onExpressionClick={this.props.onExpressionClick}
+      onElevationClick={this.props.onElevationClick}
     />
 
     const error = errors![fieldType+"."+fieldName as any] as any;