feat(number-keyboard): 新增 confirm 事件

[eiinu]

这个 PR 做了什么? (简要描述所做更改)

这个 PR 是什么类型? (至少选择一个)

• feat: 新特性提交
• fix: bug 修复
• docs: 文档改进
• style: 组件样式/交互改进
• type: 类型定义更新
• perf: 性能、包体积优化
• refactor: 代码重构、代码风格优化
• test: 测试用例
• chore(deps): 依赖升级
• chore(demo): 演示代码改进
• chore(locale): 国际化改进
• chore: 其他改动（是关于什么的改动？）

这个 PR 涉及以下平台:

• NutUI H5 @nutui/nutui
• NutUI Taro @nutui/nutui-taro

这个 PR 是否已自测:

• 自测 Vite 脚手架使用 测试仓库
• 自测 Taro 脚手架使用小程序 & Taro-H5 测试仓库

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 83.92%. Comparing base (499f576) to head (61c768f).

Files	Patch %	Lines
src/packages/__VUE/numberkeyboard/index.vue	93.75%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v4    #3059      +/-   ##
==========================================
- Coverage   83.96%   83.92%   -0.05%     
==========================================
  Files         223      223              
  Lines       23055    23039      -16     
  Branches     2477     2477              
==========================================
- Hits        19358    19335      -23     
- Misses       3679     3686       +7     
  Partials       18       18              

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