feat: add http rsr (#18)

* add histogram

* add: http success data

* filter non zero miners

* filter out non zero http rsr

* non zero Retrieval rate for miners

* set past undefined http success to 0

* comments

* comments

* block past null values

* label naming

* fix rate percent display

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Co-authored-by: Nikolas Haimerl <nikolas.haimerl@dfinity.org>