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.

### Tasks
- [x] Create Abstraction
- [x] HttpSystem accepts ContentConverter instead of ObjectMapper, also users can configure `createClient` function.
- [x] Wiremock uses StoveSerde instead of ObjectMapper
- [x] ElasticSearch uses JsonpMapper instead of ObjectMapper
- [x] MongoDb uses StoveSerde instead of ObjectMapper
- [x] Couchbase uses Encoder and Transcoder interfaces instead of ObjectMapper
- [x] spring-kafka: ser/de can be customized, during publish and assertion
- [x] standalone-kafka: ser/de can be customized, during publish and assertion
- [x] standalone-kafka: Use ShouldBeConsumed/Published with a custom deserializer. This would prevent the need of messageAsBase64.

[osoykan]

Implemented in different PRs.