Store additional fields in context instead of baggage. #1316
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Description:
This PR removes baggage propagation from the X-Ray propagator and use new context key to propagate additional fields of X-Ray trace header.
Existing Issue(s):
It is the alternative solution of #1178. It fixes incompatible issue with the W3C baggage limit of 8192 bytes by removing the baggage propagation and doesn't break X-Ray trace context propagation.
Testing:
Unit test