[FEAT] show chunk score on citations (#773)

* show similarity score in citation chunks

* refactor combine like sources to handle separate similarity scores and improve UI for displaying chunks

* fix parseChunkSource function to work with links

* destructure properties in chunks mapping

* check chunk length in parseChunkSource

* change UI on how score is shown

* remove duplicate import

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Co-authored-by: timothycarambat <rambat1010@gmail.com>