[FEATURE] Add ability to create DistributedTracingData instance from Trace Context

[russcam]

In its current form, DistributedTracingData only exposes traceparent and not tracestate, and provides a method to create DistributedTracingData only from traceparent.

The Elastic APM agents may be used with other systems that require manual propagation of traceparent and tracestate. DistributedTracingData should provide a way to both set and get tracestate.