feat(effects): 添加 scheduler 选项支持和 extend 工具函数

- 添加 extend 函数作为 Object.assign 的别名
- 修复 ReactiveEffectOptions 中 scheduler 属性拼写错误
- 实现 effect 选项配置的属性扩展功能
- 更新 lazy 示例展示 effect 运行逻辑
- 新增 scheduler 示例演示调度器功能

packages/reactivity/src/effect.ts

@@ -1,5 +1,5 @@
 import { createDep, Dep } from './dep'
-import { isArray } from '@vue/shared'
+import { extend, isArray } from '@vue/shared'
 import { ComputedRefImpl } from './computed'
 export type EffectScheduler = (...args: any[]) => any
 
@@ -15,10 +15,14 @@ const targetMap = new WeakMap<any, KeyToDepMap>()
 
 export interface ReactiveEffectOptions {
   lazy?: boolean
-  schedler?: EffectScheduler
+  scheduler?: EffectScheduler
 }
 export function effect<T = any>(fn: () => T, options?: ReactiveEffectOptions) {
   const _effect = new ReactiveEffect(fn)
+  if (options) {
+    extend(_effect, options)
+  }
+
   if (!options || !options.lazy) {
     _effect.run()
   }