Add asyncInitialization option to ServiceOptions

Author: Julien Heller

src/types/ServiceOptions.ts

@@ -33,4 +33,8 @@ export interface ServiceOptions<T, K extends keyof T> {
      */
     factory?: [ObjectType<T>, K]|((...params: any[]) => any);
 
-}
+    /**
+     * Will call instance's #initialize method and resolve the promise it returns when getting with Container.getAsync() and Container.getManyAsync().
+     */
+    asyncInitialization?: boolean;
+}