Fixed Kafka integration

[oskardudycz]

Fixed Kafka integration

• added the initialiser to docker-compose to set the Kafka topics upfront.
• fixed EventEnvelope creation to use a generic one. Changed the non-generic from record to interface to make sure that it won't be used.
• made sure that EventBus takes only EventEnvelope.
• created EventEnvelope in the external publishing.
• used handler in KafkaConsumer to deserialise contracts with private constructors,
• changed KafkaConsumer setting to commit offset manually.
• enforced EventEnvelope on in-memory bus.
• added EventEnvelopeExtensions for Kafka message deserialisation and aligned with EventStoreDB subscription to all to ignore messages that are not able to deserialise

See more in PR: #150

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This discussion was created from the release Fixed Kafka integration.