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feat: Async hooks based context tracking (#538)

Introduces a lower overhead, more correct context tracking
mechanism based on async hooks that is available when using the
trace agent on newer versions of node (>=8). To enable async
hooks based context, set the GCLOUD_TRACE_NEW_CONTEXT environment
variable. This change is not expected to have observable behavior
difference but due to the nature of context propagation it is
difficult to say for sure without real world testing.

PR-URL: https://github.com/GoogleCloudPlatform/cloud-trace-nodejs/pull/538

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