KIP-705 — Selectively Disable Topology Optimizations

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Splits the `topology.optimizations` configuration into fine-grained options (`REUSE_KTABLE_SOURCE_TOPICS`, `MERGE_REPARTITION_TOPICS`, etc.) so individual optimizations can be selectively enabled or disabled. The existing `none` / `all` binary choice caused problems because the source-changelog reuse optimization has unsafe side effects (it assumes symmetric serdes), yet users who wanted other optimizations had no way to exclude it.

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