Add possibility to disable collapsible attributions from Source

src/ol/source/Tile.js

@@ -14,6 +14,7 @@ import {wrapX, getForProjection as getTileGridForProjection} from '../tilegrid.j
 /**
  * @typedef {Object} Options
  * @property {import("./Source.js").AttributionLike} [attributions]
+ * @property {boolean} [attributionsCollapsible] Whether attributions should be collapsible.
  * @property {number} [cacheSize]
  * @property {boolean} [opaque]
  * @property {number} [tilePixelRatio]
@@ -40,6 +41,7 @@ class TileSource extends Source {
 
     super({
       attributions: options.attributions,
+      attributionsCollapsible: options.attributionsCollapsible,
       projection: options.projection,
       state: options.state,
       wrapX: options.wrapX