[clang] [clang][Diagnostics] Highlight code snippets (PR #66514)

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cor3ntin wrote:

> > I really like this direction, thanks!
> > I left a few comments, i will do another pass later
> 
> So you'd accept the lexing slowdown instead of using a maximum file size for highlighting?

Do I understand correctly that with the latest change there is no noticeable perf impact?
Otherwise, yes I'm happy limiting to 2MB - it seems the biggest files in clang are about 500K. So it should only disable highlighting on generated files, which seems reasonable

https://github.com/llvm/llvm-project/pull/66514