refactor(core): Lint to enforce lazyloading in modules (#16843)

Co-authored-by: Juuso Tapaninen <juuso@n8n.io>

packages/@n8n/decorators/src/module/module.ts

@@ -22,7 +22,7 @@ export type ModuleSettings = Record<string, unknown>;
 
 export interface ModuleInterface {
 	init?(): Promise<void>;
-	entities?(): EntityClass[];
+	entities?(): Promise<EntityClass[]>;
 	settings?(): Promise<ModuleSettings>;
 }