KIP-1047 — Introduce new org.apache.kafka.tools.api.Decoder to replace kafka.serializer.Decoder

Accepted Kafka 3.8 AdminClient

Introduces `org.apache.kafka.tools.api.Decoder` as a Java replacement for `kafka.serializer.Decoder` (Scala, in core module) to facilitate the migration of all tools-related code from core to the tools module in Kafka 4.0. The old interface cannot be retained because the core module is being dropped.

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