Added missing messaging semantic attributes on the consumer spans #856
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The current bridge implementation uses the Kafka producer interceptor way for injecting span on producing (by using the OpenTelemetry implementation) but it doesn't the same on the consumer side (because producer and consumers span are not linked the right way, as the OTel community is working to fix for the future).
For this reason we generate the Kafka consumer span manually but right now we are missing some "messaging" related smantic attributes which are added by the OTel interceptor on producer automatically.
This PR fixes this problem.