feat(TypedEvents): 添加 off 方法支持事件移除

- 在 TypedEvents 类中增加了 off 方法，用于移除事件监听器
- 该方法支持泛型，确保类型安全地移除监听器

Author: cloudcome

src/TypedEvents.ts

@@ -13,6 +13,10 @@ export class TypedEvents<T extends EventMap> {
     this.emitter.on(event as string, listener);
   }
 
+  off<K extends keyof T>(event: K, listener: (...args: T[K]) => void): void {
+    this.emitter.off(event as string, listener);
+  }
+
   async emit<K extends keyof T>(event: K, ...args: T[K]): Promise<void> {
     const listeners = this.emitter.listeners(event as string);
     for (const listener of listeners) {