feat: add custom Recording/SendButton

[Obamabo]

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

:white_check_mark: Obamabo
:x: chenjunbo.cjb

---

chenjunbo.cjb seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[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!