KIP-581 — Value of optional null field which has default value

Accepted Kafka 3.5 Connect

Adds replace.null.with.default (default true) to JsonConverter, allowing null field values that have a schema default to be preserved as null in the JSON output instead of being substituted with the default. Debezium and similar CDC connectors emit explicit nulls to represent deleted columns, but JsonConverter was silently replacing them with the schema default, corrupting the change event semantics.

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