enhance(pdf): UI lag for the case of large highlights data #8772
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related #8735
For this issue, the main reason is that serializing large highlights data to the file system is so slow with clojure.core internal solution. so this PR is trying to do this work with a three-party library https://github.com/brandonbloom/fipp, it's about 2 to 3 times faster than the built-in solution. This PR is a quick patch, not a final solution!