Make code prettier

This updates ESLint and our shared eslint-config-openlayers to use Prettier.  Most formatting changes were automatically applied with this:

    npm run lint -- --fix

A few manual changes were required:

 * In `examples/offscreen-canvas.js`, the `//eslint-disable-line` comment needed to be moved to the appropriate line to disable the error about the `'worker-loader!./offscreen-canvas.worker.js'` import.
 * In `examples/webpack/exapmle-builder.js`, spaces could not be added after a couple `function`s for some reason.  While editing this, I reworked `ExampleBuilder` to be a class.
 * In `src/ol/format/WMSGetFeatureInfo.js`, the `// @ts-ignore` comment needed to be moved down one line so it applied to the `parsersNS` argument.

src/ol/VectorRenderTile.js

@@ -1,10 +1,9 @@
 /**
  * @module ol/VectorRenderTile
  */
-import {getUid} from './util.js';
 import Tile from './Tile.js';
 import {createCanvasContext2D} from './dom.js';
-
+import {getUid} from './util.js';
 
 /**
  * @typedef {Object} ReplayState
@@ -24,7 +23,6 @@ import {createCanvasContext2D} from './dom.js';
 const canvasPool = [];
 
 class VectorRenderTile extends Tile {
-
   /**
    * @param {import("./tilecoord.js").TileCoord} tileCoord Tile coordinate.
    * @param {import("./TileState.js").default} state State.
@@ -33,7 +31,6 @@ class VectorRenderTile extends Tile {
    * to get source tiles for this tile.
    */
   constructor(tileCoord, state, urlTileCoord, getSourceTiles) {
-
     super(tileCoord, state, {transition: 0});
 
     /**
@@ -148,7 +145,7 @@ class VectorRenderTile extends Tile {
         renderedTileResolution: NaN,
         renderedTileRevision: -1,
         renderedZ: -1,
-        renderedTileZ: -1
+        renderedTileZ: -1,
       };
     }
     return this.replayState_[key];
@@ -172,5 +169,4 @@ class VectorRenderTile extends Tile {
   }
 }
 
-
 export default VectorRenderTile;