Support W3C Baggage proposed standard

[jbogard]

Is your feature request related to a problem? Please describe.

The W3C Correlation-Context proposed standard was renamed to "baggage". As part of that rename, the header was renamed from Correlation-Context to baggage.

The details of the spec are in public working draft, which remain the same as Correlation-Context except with the header name change.

Describe the solution you'd like

Prefer the baggage header name, but fall back to Correlation-Context to preserve backwards capability.

[ghost]

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We're moving this issue to the Next sprint planning milestone for future evaluation / consideration. We will evaluate the request when we are planning the work for the next milestone. To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.