feat: implement backup system with compression and bundling

- Add zstd-jni dependency for compression support
- Define Backup record with name, key, incremental, and size fields
- Implement BackupManager with backup listing, deletion, and creation methods
- Create BackupWorker to handle backup operations with server state coordination
- Refactor WorldDir to simplify dimension handling and file listing
- Introduce bundling system with SerialBundlerReader^[[1;5P/Writer for efficient storage
- Add BackupStrategy interface with LocalBackupStrategy implementation
- Support both compressed and uncompressed backup formats
- Add config option for parallel backup operations
- Remove old backup implementation from JustBackupMod
- Update backup file format with metadata footer and magic number validation

src/main/java/io/ib67/sfcraft/bundler/EntryInputStream.java

@@ -0,0 +1,33 @@
+package io.ib67.sfcraft.bundler;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+
+public class EntryInputStream extends FilterInputStream {
+    /**
+     * Creates a {@code FilterInputStream}
+     * by assigning the  argument {@code in}
+     * to the field {@code this.in} so as
+     * to remember it for later use.
+     *
+     * @param in the underlying input stream, or {@code null} if
+     *           this instance is to be created without an underlying stream.
+     */
+    protected EntryInputStream(InputStream in) {
+        super(in);
+    }
+
+    public BundlerEntry readEntry() throws IOException {
+        var len = ByteBuffer.wrap(readNBytes(4)).getInt();
+        var gunzipped = len < 0;
+        len = Math.abs(len);
+        var name = new String(readNBytes(len)).intern();
+        var buf = ByteBuffer.wrap(readNBytes(8));
+        var fileLen = buf.getLong();
+        var fileOffset = buf.getLong();
+        return new BundlerEntry(name, gunzipped, fileLen, fileOffset);
+
+    }
+}