Support AMQP Message Annotations when extracting values for Headers

[Yannic92]

In https://github.com/eclipse/ditto/issues/1389 a need for the support of message annotations for AMQP 1.0 connections was revealed.

The values of these annotations should also be extracted and put to the headers of an ExternalMessage.

Starting point could be: https://github.com/eclipse/ditto/blob/efb76399396576ad8e322a415102d26d5e2ed60c/connectivity/service/src/main/java/org/eclipse/ditto/connectivity/service/messaging/amqp/AmqpConsumerActor.java#L484

This issue should keep track of this need and provide room for discussion.