Track span id when using Cloud Tracing nodejs client @opentelemetry/tracing

[dan-sproutward]

Thanks for stopping by to let us know something could be better!

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Is your feature request related to a problem? Please describe.
LoggingWinston will send trace id but not span id to Stackdriver Logging. Cloud Trace will pick this up if it is included in the log record.
Describe the solution you'd like
Add span id to logs sent to Stackdriver Logging per https://cloud.google.com/logging/docs/agent/logging/configuration#special-fields.
Describe alternatives you've considered
None. Change needs to be made in LoggingWinston to support this. I created a shim locally that is a copy of common.js and index.js with the change.
Additional context

[dan-sproutward]

Works as expected. Thanks for picking this up.