feat(watermark): support multi-line text

[xiaoyatong]

🤔 这个变动的性质是？

• 新特性提交
• 日常 bug 修复
• 站点、文档改进
• 演示代码改进
• 组件样式/交互改进
• TypeScript 定义更新
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他改动（是关于什么的改动？）

🔗 相关 Issue

💡 需求背景和解决方案

☑️ 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
• fork仓库代码是否为最新避免文件冲突
• Files changed 没有 package.json lock 等无关文件

Summary by CodeRabbit

• 新功能

  • 更新了水印组件，支持多种状态显示，包括文本、图像和多行文本水印。
  • 新增startX和startY属性，允许用户自定义水印的起始位置。

• 文档

  • 增强了水印组件的文档，明确支持单行文本、多行文本和图像。
  • 改进了文档格式，提高可读性，添加了新的属性描述。

[coderabbitai]

Walkthrough

此次修改显著提升了 WaterMark 组件的功能与灵活性。通过将状态管理从布尔值更改为整数，组件现在能够支持多种水印显示模式。此外，文档也得到了增强，提供了更清晰的使用说明和新属性的详细介绍，提升了用户体验。

Changes

文件	更改摘要
src/packages/watermark/demos/h5/demo1.tsx	修改 flag 状态为整数，支持多种水印显示模式。更新按钮点击处理和条件渲染逻辑。
src/packages/watermark/demos/taro/demo1.tsx	同上，增强了与用户交互的响应，支持不同的水印内容及属性。
src/packages/watermark/doc.en-US.md	拓展“基本用法”部分，新增 startX 和 startY 属性说明，改善示例格式。
src/packages/watermark/doc.md	添加水印支持多种文本和图像的说明，格式优化，新增 startX 和 startY 属性。
src/packages/watermark/doc.taro.md	明确水印组件的功能，添加 startX 和 startY 属性说明，清理示例代码格式。
src/packages/watermark/doc.zh-TW.md	增加水印功能支持的描述，新增 startX 和 startY 属性说明。
src/packages/watermark/watermark.taro.tsx	在 WaterMarkProps 接口中新增 startX 和 startY 属性，更新渲染逻辑。
src/packages/watermark/watermark.tsx	同上，增强组件灵活性，允许动态定位水印文本。

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant DemoComponent
    participant WaterMark

    User->>DemoComponent: 点击按钮 (设置 flag)
    DemoComponent->>WaterMark: 根据 flag 渲染水印
    alt flag == 0
        WaterMark->>User: 显示水印内容 "NutUI-WaterMark"
    else flag == 1
        WaterMark->>User: 显示水印图像
    else flag == 2
        WaterMark->>User: 显示多行文本和多个水印
    end

Loading

Poem

🐰 在水印间跳跃，
新属性如星闪耀，
代码轻轻舞动，
用户欢悦笑，
功能更强，体验好，
兔子庆祝，咕咕叫！ 🌟

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