Merge pull request #11592 from ahocevar/new-declutter

New decluttering implementation

src/ol/VectorRenderTile.js

@@ -45,6 +45,12 @@ class VectorRenderTile extends Tile {
      */
     this.executorGroups = {};
 
+    /**
+     * Executor groups for decluttering, by layer uid. Entries are read/written by the renderer.
+     * @type {Object<string, Array<import("./render/canvas/ExecutorGroup.js").default>>}
+     */
+    this.declutterExecutorGroups = {};
+
     /**
      * Number of loading source tiles. Read/written by the source.
      * @type {number}