Adds definition of messaging annotations #29
Merged
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Per openzipkin/zipkin#1654
Notably, this also says messaging spans should never share a span ID.
This is in support of the simplified model known as span2 which will
use span.kind=PRODUCER|CONSUMER to accomplish the same. We
are mapping back to annotations because most instrumentation and
storage will need to for a while.
cc @jcarres-mdsol @ImFlog @devinsba @dgrabows @lijunyong @marcingrzejszczak @sslavic @mbogoevici @hammett