feat(form): add merge form functionality (#4495)

* feat: captcha example

* fix: fix lint errors

* chore: event handling and methods

* chore: add accessibility features ARIA labels and roles

* refactor: refactor code structure and improve captcha demo page

* feat: add captcha internationalization

* chore: 适配时间戳国际化展示

* fix: 1. 添加点击位置边界校验，防止点击外部导致x,y误差。2. 演示页面宽度过长添加滚动条。3. 添加hooks

* feat: sync test

* feat: 添加合并表单功能

* fix: 修复上一步不展示问题

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Co-authored-by: vince <vince292007@gmail.com>

playground/src/locales/langs/en-US.json

@@ -79,7 +79,8 @@
         "rules": "Form Rules",
         "dynamic": "Dynamic Form",
         "custom": "Custom Component",
-        "api": "Api"
+        "api": "Api",
+        "merge": "Merge Form"
       },
       "captcha": {
         "title": "Captcha",

playground/src/locales/langs/zh-CN.json

@@ -79,7 +79,8 @@
         "rules": "表单校验",
         "dynamic": "动态表单",
         "custom": "自定义组件",
-        "api": "Api"
+        "api": "Api",
+        "merge": "合并表单"
       },
       "captcha": {
         "title": "验证码",