Improve Serialization to work with different serializers, such as jackson, gson, kotlinx.serialization

[osoykan]

Stove supports Jackson by default, for String Ser/De. This decision limits for the use cases where Kafka needs Avro, Protobuf, or other serialization systems; or HttpSystem needs Kotlinx serialization...

This issue and PRs regarding this issue will address the improvement.

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1. Create Abstraction
2. HttpSystem accepts ContentConverter instead of ObjectMapper, also users can configure createClient function.
3. Wiremock uses StoveSerde instead of ObjectMapper
4. ElasticSearch uses JsonpMapper instead of ObjectMapper
5. MongoDb uses StoveSerde instead of ObjectMapper
6. Couchbase uses Encoder and Transcoder interfaces instead of ObjectMapper
7. spring-kafka: ser/de can be customized, during publish and assertion
8. standalone-kafka: ser/de can be customized, during publish and assertion
9. standalone-kafka: Use ShouldBeConsumed/Published with a custom deserializer. This would prevent the need of messageAsBase64.

[osoykan]

Implemented in different PRs.