refac: bootstrap()

- 각 클래스가 WeakRef로 상호 참조한다면, construct 시점엔 불가
- bootstrap() 함수로 이후 참조

@sammo/game_logic/src/LazyEntityUpdater.ts

@@ -9,6 +9,8 @@ export abstract class LazyEntityUpdater<Entity extends ValidEntity>{
 
     protected abstract readonly rsc: IResourceController;
 
+    public abstract bootstrap(): void;
+
     public get raw(): Readonly<Entity> {
         return this._raw;
     }