Feat Add Dts for Toast

[betterhyq]

这个 PR 做了什么? (简要描述所做更改)

• 添加类型声明
• 删除文档冗余内容

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

[betterhyq]

@Miles-hxy review please

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.47%. Comparing base (1bbb04b) to head (97080bd).
⚠️ Report is 4 commits behind head on v4.

Additional details and impacted files

@@           Coverage Diff           @@
##               v4    #3320   +/-   ##
=======================================
  Coverage   81.47%   81.47%           
=======================================
  Files         226      226           
  Lines       18164    18164           
  Branches     2496     2496           
=======================================
  Hits        14800    14800           
  Misses       3346     3346           
  Partials       18       18           

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