Add entry point for x-cloud-trace-context propagator #183
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Like #179, this makes it possible to use the trace propagator with environment variables and auto instrumentation. Updated docs can be seen at https://output.circle-artifacts.com/output/job/d6949a7c-a9af-4cea-bc6c-89aa4e22fbd6/artifacts/0/docs-html/cloud_trace/cloud_trace_propagator.html