Schema Registry and Avro schemas support

[fdelbrayelle]

Overview of the feature request

Avro with Schema Registry (see: https://aseigneurin.github.io/2018/08/02/kafka-tutorial-4-avro-and-schema-registry.html and https://dzone.com/articles/kafka-avro-serialization-and-the-schema-registry to help implementation) + bug #28

Motivation for or Use Case

Currently, the data are (de)serialize only through simple JSON. It could be more flexible to use Avro.

Related issues or PR

• consumer: Manage poisonned data #28 about the poison pill bug when using Avro with Schema Registry

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[fdelbrayelle]

🚧 WIP PR: https://github.com/fdelbrayelle/generator-jhipster-kafka/pull/107/files