feat(swiper): swiperItem 支持设置 className

[oasis-cloud]

🤔 这个变动的性质是？

• 新特性提交
• 日常 bug 修复

🔗 相关 Issue

💡 需求背景和解决方案

☑️ 请求合并前的自查清单

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• 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

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3eae080) 71.47% compared to head (13038ef) 71.47%.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #1504   +/-   ##
=======================================
  Coverage   71.47%   71.47%           
=======================================
  Files         202      202           
  Lines        8007     8007           
  Branches     2300     2300           
=======================================
  Hits         5723     5723           
  Misses       2081     2081           
  Partials      203      203           

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