…ect to Abstractions by introducing delivery report flow and result flow conversions for KafkaFlow and decoupling it from Confluent.Kafka.

Description

Move IMessageProducer.cs and IProducerAccessor.cs from main project to Abstractions by introducing delivery report flow and result flow conversions for KafkaFlow and decoupling it from Confluent.Kafka.

I created 3 interfaces and 3 implementations (as a transfer object) mirroring the original, replacing types withobject for those for which implementing the types would be a little too much work, and since a lot of the project already just usesobject, I followed suit.The only purpose of this PR is to move the interfaces to the Abstractions project as they are too coupled and prevents the Abstrations project to be what it should be.

Fixes # (issue)

Decouples IProducerAccessor and IMessageProducer from Confluent.Kafka'sDeliveryResult andDeliveryReport and moves the Interfaces to the ideal place: the Abstractions project.

How Has This Been Tested?

Imported my local KafkaFlow to both a producing and consumer project and it ran without throwing an exception.
An extra manual check would be appreciated.

Checklist

• [ x ] My code follows the style guidelines of this project
• [ x ] I have performed a self-review of my own code
• I have added tests to cover my changes
• I have made corresponding changes to the documentation

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