SpanContext.remote constructor
      
      SpanContext.remote(
    
- TraceId traceId,
- SpanId spanId,
- int traceFlags,
- TraceState traceState,
Construct a SpanContext representing an operation which originated from a remote source.
Implementation
SpanContext.remote(
    this.traceId, this.spanId, this.traceFlags, this.traceState)
    : isRemote = true;