plugins: refactory to use default export for new backend system

Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: Camila Belo <camilaibs@gmail.com>
Co-authored-by: Johan Haals <johan.haals@gmail.com>
Co-authored-by: Philipp Hugenroth <philipph@spotify.com>
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/periskop-backend/api-report.md

@@ -12,7 +12,8 @@ import { Logger } from 'winston';
 export function createRouter(options: RouterOptions): Promise<express.Router>;
 
 // @alpha
-export const periskopPlugin: () => BackendFeature;
+const periskopPlugin: () => BackendFeature;
+export default periskopPlugin;
 
 // @public (undocumented)
 export interface RouterOptions {

plugins/periskop-backend/src/index.ts

@@ -15,4 +15,4 @@
  */
 
 export * from './service/router';
-export { periskopPlugin } from './plugin';
+export { periskopPlugin as default } from './plugin';