Core: Add data compaction policy schema (#945)

Author: flyrain

polaris-core/src/main/resources/schemas/policies/system/data-compaction/2025-02-03.json

@@ -0,0 +1,39 @@
+{
+  "license": "Licensed under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)",
+  "$id": "https://polaris.apache.org/schemas/policies/system/data-compaction/2025-02-03.json",
+  "title": "Data Compaction Policy",
+  "description": "Inheritable Polaris policy schema for Iceberg table data compaction.",
+  "type": "object",
+  "properties": {
+    "version": {
+      "type": "string",
+      "const": "2025-02-03",
+      "description": "Schema version."
+    },
+    "enable": {
+      "type": "boolean",
+      "description": "Enable or disable data compaction."
+    },
+    "config": {
+      "type": "object",
+      "description": "A map containing custom configuration properties. Please note that interoperability is not guaranteed.",
+      "additionalProperties": {
+        "type": ["string", "number", "boolean"]
+      }
+    }
+  },
+  "required": ["enable"],
+  "additionalProperties": false,
+  "examples": [
+    {
+      "version": "2025-02-03",
+      "enable": true,
+      "config": {
+        "target_file_size_bytes": 134217728,
+        "compaction_strategy": "bin-pack",
+        "max-concurrent-file-group-rewrites": 5,
+        "my-key": "my-value"
+      }
+    }
+  ]
+}