Support the new W3C random flag.

[carlosalberto]

Is your feature request related to a problem?

Have SpanContext support the new W3C random flag.

Describe the solution you'd like

Have SpanContext support the new W3C random flag.

Describe alternatives you've considered

No response

Additional Context

No response

Would you like to implement a fix?

None

Tip

_{React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it. Learn more here.}