KIP-58 — Make Log Compaction Point Configurable

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Adds a min.compaction.lag.ms configuration that guarantees a minimum time window during which messages in a compacted topic's log head are retained uncompacted. Without a lower bound on the uncompacted head, the compactor could compact a topic down to the last message written, causing consumers that fell even slightly behind to read only the final compacted value instead of intermediate updates.

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