feat: Allow customizing GRID_UNIT for the Zelos renderer. (#8636)

core/renderers/zelos/constants.ts

@@ -151,9 +151,19 @@ export class ConstantProvider extends BaseConstantProvider {
    */
   SQUARED: Shape | null = null;
 
-  constructor() {
+  /**
+   * Creates a new ConstantProvider.
+   *
+   * @param gridUnit If set, defines the base unit used to calculate other
+   *     constants.
+   */
+  constructor(gridUnit?: number) {
     super();
 
+    if (gridUnit) {
+      this.GRID_UNIT = gridUnit;
+    }
+
     this.SMALL_PADDING = this.GRID_UNIT;
 
     this.MEDIUM_PADDING = 2 * this.GRID_UNIT;