Destionation Kafka - Support for JSON schema

[maver1ck]

Tell us about the problem you're trying to solve

Adding JSON Schema for Kafka destination gives possibility for Schema enforcement and helps downstream tools when reading Kafka topics.
Confluent Schema Registry support JSON Schema.

Describe the solution you’d like

Add option to specify format of Kafka Destination. One of: JSON, JSON Schema.
When JSON Schema is chosen then add configuration for Schema Registry

Describe the alternative you’ve considered or used

For CDC I can use Kafka Connect. When reading from API there is no alternative.

Are you willing to submit a PR?

Maybe in the future. I'm new to Airbyte.