Implement ol/geom/Geometry#containsXY

Fixes issue #8863
ol/source/Vector#getFeaturesAtCoordinate and
implementations of ol/geom/Geometry#containsXY

src/ol/geom/MultiLineString.js

@@ -100,17 +100,6 @@ class MultiLineString extends SimpleGeometry {
     return new MultiLineString(this.flatCoordinates.slice(), this.layout, this.ends_.slice());
   }
 
-  /**
-   * @inheritDoc
-   * @override
-   * @api
-   */
-  containsXY(x, y) {
-    return this.getLineStrings().some(function(lineString) {
-      return lineString.containsXY(x, y);
-    });
-  }
-
   /**
    * @inheritDoc
    */