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>

cypress/e2e/layers.cy.ts

@@ -550,6 +550,104 @@ describe("layers", () => {
     });
   });
 
+  describe("hillshade", () => {
+    it("add", () => {
+      const id = when.modal.fillLayers({
+        type: "hillshade",
+        layer: "example",
+      });
+
+      then(get.styleFromLocalStorage()).shouldDeepNestedInclude({
+        layers: [
+          {
+            id: id,
+            type: "hillshade",
+            source: "example",
+          },
+        ],
+      });
+    });
+
+    it("set hillshade illumination direction array", () => {
+      const id = when.modal.fillLayers({
+        type: "hillshade",
+        layer: "example",
+      });
+      when.collapseGroupInLayerEditor();
+      when.collapseGroupInLayerEditor(1);
+      when.setValueToPropertyArray("spec-field:hillshade-illumination-direction", '1');
+      when.addValueToPropertyArray("spec-field:hillshade-illumination-direction", '2');
+      when.addValueToPropertyArray("spec-field:hillshade-illumination-direction", '3');
+      when.addValueToPropertyArray("spec-field:hillshade-illumination-direction", '4');
+
+      then(get.styleFromLocalStorage()).shouldDeepNestedInclude({
+        layers: [
+          {
+            id: id,
+            type: "hillshade",
+            source: "example",
+            paint: {
+              "hillshade-illumination-direction": [ 1, 2, 3, 4 ]
+            }
+          },
+        ],
+      });
+    });
+
+    it("set hillshade highlight color array", () => {
+      const id = when.modal.fillLayers({
+        type: "hillshade",
+        layer: "example",
+      });
+      when.collapseGroupInLayerEditor();
+      when.setValueToPropertyArray("spec-field:hillshade-highlight-color", 'blue');
+      when.addValueToPropertyArray("spec-field:hillshade-highlight-color", '#00ff00');
+      when.addValueToPropertyArray("spec-field:hillshade-highlight-color", 'rgba(255, 255, 0, 1)');
+
+      then(get.styleFromLocalStorage()).shouldDeepNestedInclude({
+        layers: [
+          {
+            id: id,
+            type: "hillshade",
+            source: "example",
+            paint: {
+              "hillshade-highlight-color": [ "blue", "#00ff00", "rgba(255, 255, 0, 1)" ]
+            }
+          },
+        ],
+      });
+    });
+  });
+
+  describe("color-relief", () => {
+    it("add", () => {
+      const id = when.modal.fillLayers({
+        type: "color-relief",
+        layer: "example",
+      });
+
+      then(get.styleFromLocalStorage()).shouldDeepNestedInclude({
+        layers: [
+          {
+            id: id,
+            type: "color-relief",
+            source: "example",
+          },
+        ],
+      });
+    });
+
+    it("adds elevation expression when clicking the elevation button", () => {
+      when.modal.fillLayers({
+        type: "color-relief",
+        layer: "example",
+      });
+      when.collapseGroupInLayerEditor();
+      when.click("make-elevation-function");
+      then(get.element("[data-wd-key='spec-field-container:color-relief-color'] .CodeMirror-line")).shouldBeVisible();
+    });
+  });
+
   describe("groups", () => {
     it("simple", () => {
       when.setStyle("geojson");

cypress/e2e/maputnik-driver.ts

@@ -176,8 +176,25 @@ export class MaputnikDriver {
         .type(text, { parseSpecialCharSequences: false });
     },
 
+    setValueToPropertyArray: (selector: string, value: string) => {
+      this.when.doWithin(selector, () => {
+        this.helper.get.element(".maputnik-array-block-content input").last().type("{selectall}"+value, {force: true });
+      });
+    },
+
+    addValueToPropertyArray: (selector: string, value: string) => {
+      this.when.doWithin(selector, () => {
+        this.helper.get.element(".maputnik-array-add-value").click({ force: true });
+        this.helper.get.element(".maputnik-array-block-content input").last().type("{selectall}"+value, {force: true });
+      });
+    },
+
     closePopup: () => {
       this.helper.get.element(".maplibregl-popup-close-button").click();
+    },
+
+    collapseGroupInLayerEditor: (index = 0) => {
+      this.helper.get.element(".maputnik-layer-editor-group__button").eq(index).realClick();
     }
   };