WebGPURenderer: Add support for VSM.

examples-testing/changes.patch

@@ -15252,6 +15252,49 @@ index a410c04f..64814a2b 100644
 
  init();
 
+diff --git a/examples-testing/examples/webgpu_shadowmap_vsm.ts b/examples-testing/examples/webgpu_shadowmap_vsm.ts
+index a9f6f0e5..c68aa5fc 100644
+--- a/examples-testing/examples/webgpu_shadowmap_vsm.ts
++++ b/examples-testing/examples/webgpu_shadowmap_vsm.ts
+@@ -1,14 +1,24 @@
+-import * as THREE from 'three';
++import * as THREE from 'three/webgpu';
+
+ import Stats from 'three/addons/libs/stats.module.js';
+ import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
+
+ import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
+
+-let camera, scene, renderer, clock, stats;
+-let dirLight, spotLight;
+-let torusKnot, dirGroup;
+-let config;
++let camera: THREE.PerspectiveCamera,
++    scene: THREE.Scene,
++    renderer: THREE.WebGPURenderer,
++    clock: THREE.Clock,
++    stats: Stats;
++let dirLight: THREE.DirectionalLight, spotLight: THREE.SpotLight;
++let torusKnot: THREE.Mesh, dirGroup: THREE.Group;
++let config: {
++    spotlightRadius: number;
++    spotlightSamples: number;
++    dirlightRadius: number;
++    dirlightSamples: number;
++    animate: boolean;
++};
+
+ init();
+
+@@ -188,7 +198,7 @@ function onWindowResize() {
+     renderer.setSize(window.innerWidth, window.innerHeight);
+ }
+
+-function animate(time) {
++function animate(time: DOMHighResTimeStamp) {
+     const delta = clock.getDelta();
+
+     if (config.animate === true) {
 diff --git a/examples-testing/examples/webgpu_sky.ts b/examples-testing/examples/webgpu_sky.ts
 index 097d06af..3836e7ee 100644
 --- a/examples-testing/examples/webgpu_sky.ts