[feature request] Support the new W3C random flag.

[carlosalberto]

Package

None

Is your feature request related to a problem?

Have SpanContext support the new W3C random flag.

What is the expected behavior?

SpanContext support the new W3C random flag.

Which alternative solutions or features have you considered?

?

Additional context

No response

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[martincostello]

Looks like that part of the spec is still in development.