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/render/canvas/LineStringBuilder.js

@@ -1,8 +1,11 @@
 /**
  * @module ol/render/canvas/LineStringBuilder
  */
-import CanvasInstruction, {strokeInstruction, beginPathInstruction} from './Instruction.js';
 import CanvasBuilder from './Builder.js';
+import CanvasInstruction, {
+  beginPathInstruction,
+  strokeInstruction,
+} from './Instruction.js';
 
 class CanvasLineStringBuilder extends CanvasBuilder {
   /**
@@ -26,8 +29,18 @@ class CanvasLineStringBuilder extends CanvasBuilder {
   drawFlatCoordinates_(flatCoordinates, offset, end, stride) {
     const myBegin = this.coordinates.length;
     const myEnd = this.appendFlatCoordinates(
-      flatCoordinates, offset, end, stride, false, false);
-    const moveToLineToInstruction = [CanvasInstruction.MOVE_TO_LINE_TO, myBegin, myEnd];
+      flatCoordinates,
+      offset,
+      end,
+      stride,
+      false,
+      false
+    );
+    const moveToLineToInstruction = [
+      CanvasInstruction.MOVE_TO_LINE_TO,
+      myBegin,
+      myEnd,
+    ];
     this.instructions.push(moveToLineToInstruction);
     this.hitDetectionInstructions.push(moveToLineToInstruction);
     return end;
@@ -46,14 +59,27 @@ class CanvasLineStringBuilder extends CanvasBuilder {
     }
     this.updateStrokeStyle(state, this.applyStroke);
     this.beginGeometry(lineStringGeometry, feature);
-    this.hitDetectionInstructions.push([
-      CanvasInstruction.SET_STROKE_STYLE,
-      state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
-      state.miterLimit, state.lineDash, state.lineDashOffset
-    ], beginPathInstruction);
+    this.hitDetectionInstructions.push(
+      [
+        CanvasInstruction.SET_STROKE_STYLE,
+        state.strokeStyle,
+        state.lineWidth,
+        state.lineCap,
+        state.lineJoin,
+        state.miterLimit,
+        state.lineDash,
+        state.lineDashOffset,
+      ],
+      beginPathInstruction
+    );
     const flatCoordinates = lineStringGeometry.getFlatCoordinates();
     const stride = lineStringGeometry.getStride();
-    this.drawFlatCoordinates_(flatCoordinates, 0, flatCoordinates.length, stride);
+    this.drawFlatCoordinates_(
+      flatCoordinates,
+      0,
+      flatCoordinates.length,
+      stride
+    );
     this.hitDetectionInstructions.push(strokeInstruction);
     this.endGeometry(feature);
   }
@@ -71,17 +97,30 @@ class CanvasLineStringBuilder extends CanvasBuilder {
     }
     this.updateStrokeStyle(state, this.applyStroke);
     this.beginGeometry(multiLineStringGeometry, feature);
-    this.hitDetectionInstructions.push([
-      CanvasInstruction.SET_STROKE_STYLE,
-      state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
-      state.miterLimit, state.lineDash, state.lineDashOffset
-    ], beginPathInstruction);
+    this.hitDetectionInstructions.push(
+      [
+        CanvasInstruction.SET_STROKE_STYLE,
+        state.strokeStyle,
+        state.lineWidth,
+        state.lineCap,
+        state.lineJoin,
+        state.miterLimit,
+        state.lineDash,
+        state.lineDashOffset,
+      ],
+      beginPathInstruction
+    );
     const ends = multiLineStringGeometry.getEnds();
     const flatCoordinates = multiLineStringGeometry.getFlatCoordinates();
     const stride = multiLineStringGeometry.getStride();
     let offset = 0;
     for (let i = 0, ii = ends.length; i < ii; ++i) {
-      offset = this.drawFlatCoordinates_(flatCoordinates, offset, /** @type {number} */ (ends[i]), stride);
+      offset = this.drawFlatCoordinates_(
+        flatCoordinates,
+        offset,
+        /** @type {number} */ (ends[i]),
+        stride
+      );
     }
     this.hitDetectionInstructions.push(strokeInstruction);
     this.endGeometry(feature);
@@ -92,7 +131,10 @@ class CanvasLineStringBuilder extends CanvasBuilder {
    */
   finish() {
     const state = this.state;
-    if (state.lastStroke != undefined && state.lastStroke != this.coordinates.length) {
+    if (
+      state.lastStroke != undefined &&
+      state.lastStroke != this.coordinates.length
+    ) {
       this.instructions.push(strokeInstruction);
     }
     this.reverseHitDetectionInstructions();
@@ -104,7 +146,10 @@ class CanvasLineStringBuilder extends CanvasBuilder {
    * @param {import("../canvas.js").FillStrokeState} state State.
    */
   applyStroke(state) {
-    if (state.lastStroke != undefined && state.lastStroke != this.coordinates.length) {
+    if (
+      state.lastStroke != undefined &&
+      state.lastStroke != this.coordinates.length
+    ) {
       this.instructions.push(strokeInstruction);
       state.lastStroke = this.coordinates.length;
     }
@@ -114,5 +159,4 @@ class CanvasLineStringBuilder extends CanvasBuilder {
   }
 }
 
-
 export default CanvasLineStringBuilder;