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.

rendering/cases/layer-vector-multigeometry-decluttering/main.js

@@ -1,16 +1,16 @@
-import Map from '../../../src/ol/Map.js';
-import View from '../../../src/ol/View.js';
 import GeoJSON from '../../../src/ol/format/GeoJSON.js';
+import Map from '../../../src/ol/Map.js';
 import VectorLayer from '../../../src/ol/layer/Vector.js';
 import VectorSource from '../../../src/ol/source/Vector.js';
+import View from '../../../src/ol/View.js';
 import {Fill, Stroke, Style, Text} from '../../../src/ol/style.js';
 
 const map = new Map({
   target: 'map',
   view: new View({
     center: [-17465028, 2331736],
-    zoom: 5
-  })
+    zoom: 5,
+  }),
 });
 
 const labelStyle = new Style({
@@ -18,38 +18,37 @@ const labelStyle = new Style({
     font: '16px Ubuntu',
     overflow: true,
     fill: new Fill({
-      color: '#000'
+      color: '#000',
     }),
     stroke: new Stroke({
       color: '#fff',
-      width: 3
-    })
-  })
+      width: 3,
+    }),
+  }),
 });
 const countryStyle = new Style({
   fill: new Fill({
-    color: 'rgba(255, 255, 255, 0.6)'
+    color: 'rgba(255, 255, 255, 0.6)',
   }),
   stroke: new Stroke({
     color: '#319FD3',
-    width: 1
-  })
+    width: 1,
+  }),
 });
 const style = [countryStyle, labelStyle];
 
 const vectorLayer = new VectorLayer({
   source: new VectorSource({
     url: '/data/countries.json',
-    format: new GeoJSON()
+    format: new GeoJSON(),
   }),
-  style: function(feature) {
+  style: function (feature) {
     labelStyle.getText().setText(feature.get('name'));
     return style;
   },
-  declutter: true
+  declutter: true,
 });
 
 map.addLayer(vectorLayer);
 
-
 render({tolerance: 0.007});