Create stackdriver-core gem with code to manage trace context #1103
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Create a stackdriver-core gem for shared code among the various Stackdriver libraries.
Initially, this gem implements TraceContext tracking (currently partially implemented in google-cloud-logging). I want to centralize it because the Trace instrumentation work requires that multiple libraries (currently google-cloud-trace and google-cloud-logging, but likely to include the other Stackdriver gems in the future) be able to cooperate in managing this context data.
After the stackdriver-core gem is released, google-cloud-logging will be modified to use this central code rather than its own partial implementation.
Note: a previous proposal added this functionality to google-cloud-core (see #1098). However, @blowmage and @dazuma decided offline to split off a separate gem instead.