feat(jmanus): the chat component has added markdown preview and code block highlighting #2124
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Describe what this PR does / why we need it
the chat component has added markdown preview and code block highlighting.
Does this pull request fix one issue?
NONE
Describe how you did it
Added marked + DOMPurify for safe preview and highlight.js for code syntax highlighting.
Describe how to verify it
生成一个Java代码给我,打印Hello World。


以markdown的形式写一个博客说明。
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