Merge pull request #1337 from codeflorist/feature/preload-fetchpriority

feat: add `fetchpriority=high` to image preload elements

Author: ThornWalli

src/runtime/components/BoosterImage/classes/Source.ts

@@ -97,7 +97,8 @@ export default class Source implements ISource {
       imagesrcset: srcset,
       imagesizes: sizes,
       media: this.media,
-      crossorigin: crossorigin as HTMLCrossOriginAttribute
+      crossorigin: crossorigin as HTMLCrossOriginAttribute,
+      fetchpriority: 'high'
     };
     return preload;
   }