feat: Button Badge add contentClassName

[DaiQiangReal]

中文模板 / Chinese Template

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PR description

Fixes #

Changelog

🇨🇳 Chinese

• Feat: Button Badge 新增 contentClassName 与 countClassName api 用于向内部元素挂载 className
• Feat: extra-small 大小的 Avatar 支持 BottonSlot
• Fix: Badge className 功能对齐其他组件，作用于 dom 最外层

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🇺🇸 English

• Feat: Button Badge adds contentClassName api to attach className to internal elements
• Feat: Extra-small Avatar supports BottonSlot
• Fix: Badge className function aligns other components and acts on the outermost layer of DOM

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