[BUG] <customMarkDownComponents not support mdx>

[febear]

Is there an existing issue for this?

• I have searched the existing issues

Which Component

Chat

Semi Version

2.71.2

Current Behavior

customMarkDownComponents not support mdx，because MarkdownRender prop "format"="md"
code Link:
https://github.com/DouyinFE/semi-design/blob/main/packages/semi-ui/chat/chatBox/chatBoxContent.tsx#L53
https://github.com/DouyinFE/semi-design/blob/main/packages/semi-ui/chat/chatBox/chatBoxContent.tsx#L62

key is not right, use a string "index" not a variable index
code Link:
https://github.com/DouyinFE/semi-design/blob/main/packages/semi-ui/chat/chatBox/chatBoxContent.tsx#L61
https://github.com/DouyinFE/semi-design/blob/main/packages/semi-ui/chat/chatBox/chatBoxContent.tsx#L67
https://github.com/DouyinFE/semi-design/blob/main/packages/semi-ui/chat/chatBox/chatBoxContent.tsx#L71

Expected Behavior

I wish the Chat component to provide the MarkdownRender "format" parameter configuration so that I can implement MDX functionality when I use customMarkDownComponents

Steps To Reproduce

No response

ReproducibleCode

No response

Environment

- OS: MacOS
- browser: chrome

Anything else?

No response