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Add deterministic sampling #4
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This provides a way to set the sampling rate by instantiating a new
DeterministicSampler.We will want to set the sample rate to the same value in every service so let's just pick an arbitrary number like
4(which would be 25% of traces get sampled).The code in the README shows how we might assign the parent span based on the
x-now-id.Fixes #2