Set reprojection canvas context options

Add example of disabling image smoothing

Add test for reprojection context options

src/ol/source/WMTS.js

@@ -23,6 +23,8 @@ import {appendParams} from '../uri.js';
  * @property {import("../proj.js").ProjectionLike} [projection] Projection. Default is the view projection.
  * @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).
  * Higher values can increase reprojection performance, but decrease precision.
+ * @property {object} [reprojectionContextOptions] Optional properties to set on the canvas context used
+ * for reprojection. For example specify `{imageSmoothingEnabled: false}` to disable image smoothing.
  * @property {import("./WMTSRequestEncoding.js").default|string} [requestEncoding='KVP'] Request encoding.
  * @property {string} layer Layer name as advertised in the WMTS capabilities.
  * @property {string} style Style name as advertised in the WMTS capabilities.
@@ -87,6 +89,7 @@ class WMTS extends TileImage {
       crossOrigin: options.crossOrigin,
       projection: options.projection,
       reprojectionErrorThreshold: options.reprojectionErrorThreshold,
+      reprojectionContextOptions: options.reprojectionContextOptions,
       tileClass: options.tileClass,
       tileGrid: tileGrid,
       tileLoadFunction: options.tileLoadFunction,