chore(world): remove unused relation ID imports

Author: codehz

src/world.ts

@@ -3,15 +3,13 @@ import { ComponentChangeset } from "./changeset";
 import { CommandBuffer, type Command } from "./command-buffer";
 import type { ComponentId, EntityId, WildcardRelationId } from "./entity";
 import {
-  decodeRelationId,
   EntityIdManager,
   getComponentIdByName,
   getComponentNameById,
   getDetailedIdType,
   isCascadeDeleteComponent,
   isDontFragmentComponent,
   isExclusiveComponent,
-  isRelationId,
   relation,
 } from "./entity";
 import { MultiMap } from "./multi-map";