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sample before propagation, context switching, and writing #3866

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What does this PR do?
This change is so that sampling will be performed as late as possible for a trace. This gives us the greatest amount of information we can have on a trace available (namely tags and resource name) to choose if that trace should be sampled or not.

  1. Modifies the sampler so that it can evaluate right before propagation, forking, or writing occurs.
  2. Samples right before the above scenarios
  3. Removes sampling on span creation.

Motivation:
Bring Ruby tracer in line with other tracers and allow further user fine grain control over sampling.

How to test the change?

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