Feature: Implement screen-space lens flare light source and rendering

src/runtime-three/runtime-host.ts

@@ -113,6 +113,10 @@ import {
   resolveDominantScreenSpaceGodRaysLightInput,
   syncScreenSpaceGodRaysLightSource
 } from "../rendering/screen-space-god-rays";
+import {
+  createScreenSpaceLensFlareLightSource,
+  syncScreenSpaceLensFlareLightSource
+} from "../rendering/screen-space-lens-flare";
 import {
   fitCelestialDirectionalShadow,
   resolveDominantCelestialShadowCaster
@@ -706,6 +710,8 @@ export class RuntimeHost {
   private readonly sunLight = new DirectionalLight();
   private readonly moonLight = new DirectionalLight();
   private readonly godRaysLightSource = createScreenSpaceGodRaysLightSource();
+  private readonly lensFlareLightSource =
+    createScreenSpaceLensFlareLightSource();
   private readonly distanceFogSkyColorSource =
     createDistanceFogSkyColorSource();
   private readonly localLightGroup = new Group();