KIP-295 — Add Streams Configuration Allowing for Optional Topology Optimization

Accepted Kafka 2.0 Streams

Adds a `topology.optimization` config to Kafka Streams (defaulting to `none`) that enables optional DSL-level topology optimizations such as merging redundant repartition topics. Without an explicit opt-in config, enabling automatic topology rewrites would be a breaking change for existing applications that depend on the current physical topology structure.

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