[Custom Issue]: Post-processing - Refactor internal representation of vernier data for better thread/rank representation #232
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Brief description
Currently the internal representation of a vernier calliper's data is a python list of length n_ranks. Each calliper had the thread ID baked in, so threading information is preserved that way.
This issue will refactor that representation such that a calliper's data is numpy array of shape (n_ranks, n_threads)
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