Add DefaultSpan in the API. #63
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This PR adds
DefaultSpan, which simply carries a specifiedSpanContext.This is done to: 1) Define an actual
INVALID_SPANand to 2) Later add support for context-propagation for ourDefaultTracer(to be added).(
DefaultTracerin Java is expected to be the no-op implementation that simply does context-propagation. Something to consider here, too, is whether we want to have this functionality in the actual baseSpan/Tracerclasses ;) )