Implementation for the latest Messaging Semantic conventions.

[cbos]

Update Messaging span with the latest semantic conventions.
https://github.com/open-telemetry/semantic-conventions/blob/v1.30.0/docs/messaging/messaging-spans.md

By default nothing changes, it adheres to this:

• SHOULD introduce an environment variable OTEL_SEMCONV_STABILITY_OPT_IN
  in the existing major version which is a comma-separated list of values.
  The list of values includes:
  • messaging - emit the new, stable messaging conventions,
    and stop emitting the old experimental messaging conventions
    that the instrumentation emitted previously.
  • messaging/dup - emit both the old and the stable messaging conventions,
    allowing for a seamless transition.
  • The default behavior (in the absence of one of these values) is to continue
    emitting whatever version of the old experimental messaging conventions
    the instrumentation was emitting previously.
  • Note: messaging/dup has higher precedence than messaging in case both values are present

[linux-foundation-easycla]

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