feat: add custom Recording/SendButton

[Obamabo]

No description provided.

[CLAassistant]

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✅ Obamabo
❌ chenjunbo.cjb

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[Obamabo]

https://github.com/alibaba/ChatUI/compare/next...Obamabo:ChatUI:feature/0.0.1?expand=1

支持自定义发送按钮/发送语音自定义动画

[Lijiaoa]

It's a great job for chatUI. And Expect merge it to the master!