feature: add top progress when use PreviewGroup

[zpc7]

[English Template / 英文模板]

🤔 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

Image 希望显示 current / total 浏览进度的标题

💡 需求背景和解决方案

📝 更新日志

语言	更新描述
🇺🇸 英文	preview group adds the title of the browsing progress at the top
🇨🇳 中文	PreviewGroup 添加顶部浏览进度的标识

☑️ 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

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/react-component/image/8nMG7UmibBqtLuh7BLSo5vDfLywC
✅ Preview: https://image-git-fork-zpc7-feature-preview-grou-43d4f0-react-component.vercel.app

[codecov]

Codecov Report

Merging #118 (cb57465) into master (82b2eae) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #118   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          266       271    +5     
  Branches        76        81    +5     
=========================================
+ Hits           266       271    +5     

Impacted Files	Coverage Δ
src/Preview.tsx	100.00% <100.00%> (ø)
src/PreviewGroup.tsx	100.00% <100.00%> (ø)

📣 Codecov can now indicate which changes are the most critical in Pull Requests. Learn more

[zombieJ]

+ rc-image@5.5.0