* Implement tracing for Attestation and Template services
* Pipeline no longer requires service name if opting into distributed tracing; enable tracing in attestation service
* Generate user-agent header from request activity policy
* Added test to catch the redacted header regression
* Updated documentation to reflect API surface changes
* OpenTelemetry API Review Feedback
* Returns std::unique_ptr<DiagnosticTracingFactory instead of raw pointer
* Late breaking pull request feedback
* Renamed clientContext parameter to CreateSpan
* Renamed ContextAndSpanFactory to TracingContextFactory and CreateSpan to CreateTracingContext.
