chore: Add changelog entry for #12833

changes/feat-12833.en.md

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+Added REST API endpoints and CLI commands for durable storage management.
+
+New REST endpoints:
+
+- `/ds/sites`
+- `/ds/sites/:site`
+- `/ds/storages`
+- `/ds/storages/:ds`
+- `/ds/storages/:ds/replicas`
+- `/ds/storages/:ds/replicas/:site`
+
+New CLI commands:
+
+- `ds set_replicas`
+- `ds join`
+- `ds leave`