Add instrumentation to monitor the impact of schema updates on compression efficiency #77
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This PR is the first in a series of two PRs with the ultimate goal of eliminating the observed degradation of the compression rate over time for Lightstep's span-type data.
This first PR focuses on the instrumentation of the code to better understand the impact of certain schema changes on the average compression rate (see the chart below).
The second PR will address this issue by identifying dictionary overflow that could be better handled as dictionary reset.