KIP-921 — OpenJDK CRaC support

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KIP-921 adds support for OpenJDK CRaC (Coordinated Restore at Checkpoint), allowing Kafka brokers and clients to checkpoint their JVM state to disk and restore it with near-zero startup time. Kafka's long JVM warmup time (connection establishment, metadata loading, JIT compilation) makes it a poor fit for elastic scaling scenarios where fast restart is critical.

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