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/tilecoord.js

@@ -2,7 +2,6 @@
  * @module ol/tilecoord
  */
 
-
 /**
  * An array of three numbers representing the location of a tile in a tile
  * grid. The order is `z` (zoom level), `x` (column), and `y` (row).
@@ -10,7 +9,6 @@
  * @api
  */
 
-
 /**
  * @param {number} z Z.
  * @param {number} x X.
@@ -29,7 +27,6 @@ export function createOrUpdate(z, x, y, opt_tileCoord) {
   }
 }
 
-
 /**
  * @param {number} z Z.
  * @param {number} x X.
@@ -40,7 +37,6 @@ export function getKeyZXY(z, x, y) {
   return z + '/' + x + '/' + y;
 }
 
-
 /**
  * Get the key for a tile coord.
  * @param {TileCoord} tileCoord The tile coord.
@@ -50,7 +46,6 @@ export function getKey(tileCoord) {
   return getKeyZXY(tileCoord[0], tileCoord[1], tileCoord[2]);
 }
 
-
 /**
  * Get a tile coord given a key.
  * @param {string} key The tile coord key.
@@ -60,7 +55,6 @@ export function fromKey(key) {
   return key.split('/').map(Number);
 }
 
-
 /**
  * @param {TileCoord} tileCoord Tile coord.
  * @return {number} Hash.
@@ -69,7 +63,6 @@ export function hash(tileCoord) {
   return (tileCoord[1] << tileCoord[0]) + tileCoord[2];
 }
 
-
 /**
  * @param {TileCoord} tileCoord Tile coordinate.
  * @param {!import("./tilegrid/TileGrid.js").default} tileGrid Tile grid.