Scafolding for cluster cli components

Signed-off-by: Peter Nied <[email protected]>

MetadataMigration/src/main/java/org/opensearch/migrations/cli/Clusters.java

@@ -0,0 +1,29 @@
+package org.opensearch.migrations.cli;
+
+import java.util.List;
+import lombok.Builder;
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class Clusters {
+    public Source source;
+    public Target target;
+    public List<Message> messages;
+
+    public Clusters() {
+    }
+
+    public String print() {
+        (new Printable().Builder()).level(0).build();
+
+        final var sb = new StringBuilder("Clusters");
+        return sb.toString();
+    }
+
+    @Builder
+    public static class Printable {
+        public int level;
+        public String section;
+        public List<String> entries;
+    }
+}

MetadataMigration/src/main/java/org/opensearch/migrations/cli/Message.java

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+package org.opensearch.migrations.cli;
+
+public class Message {
+}

MetadataMigration/src/main/java/org/opensearch/migrations/cli/Source.java

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+package org.opensearch.migrations.cli;
+
+public class Source {
+
+}

MetadataMigration/src/main/java/org/opensearch/migrations/cli/Target.java

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+package org.opensearch.migrations.cli;
+
+public class Target {
+
+}