Compress ZooKeeper replication logs

[ikhoon]

Motivation:

When a file is newly created or has a large diff, the replication log size can grow significantly. With compression, up to about 7–8 MB of data can be stored in a single znode, improving replication performance.

Modifcations:

• Add zstd-jni dependency to the server module.
• Compress replication logs using zstd before storing them in ZooKeeper.

Result:

Central Dogma server now compresses replication logs with zstd.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9ec26eefc0b9d82dc6bc6fa9bfc7a6c305076093 and f025b1df013dce90b10b6eb36324e02ea80b9ece.

📒 Files selected for processing (1)

• server/src/main/java/com/linecorp/centraldogma/server/internal/replication/ZooKeeperCommandExecutor.java (2 hunks)

✨ Finishing touches

• [ ] 📝 Generate docstrings

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment

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