feat(Watermark): Add Watermark Component

[Wesley-0808]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

💡 需求背景和解决方案

📝 更新日志

• feat(Watermark): 新增 Watermark 水印组件

• 本条 PR 不需要纳入 Changelog

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[github-actions]

[pkg-pr-new]

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npm i https://pkg.pr.new/tdesign-mobile-react@804

commit: 4e931b0

[codecov-commenter]

Codecov Report

❌ Patch coverage is 5.12821% with 111 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.70%. Comparing base (02b774b) to head (4e931b0).
⚠️ Report is 316 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/watermark/Watermark.tsx	1.26%	78 Missing ⚠️
src/hooks/useVariables.ts	3.12%	31 Missing ⚠️
src/watermark/utils.ts	50.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #804       +/-   ##
============================================
+ Coverage     6.93%   56.70%   +49.77%     
============================================
  Files          400      287      -113     
  Lines         4241     7239     +2998     
  Branches       990     1964      +974     
============================================
+ Hits           294     4105     +3811     
+ Misses        3947     3134      -813     

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