MaimMim Man in the middle minetest interceptor

- prototype
- between client and server, allow to capture all exchanges and potentially change them
- created to capture server maps in laby
- first test get only MapBlock, support version serialization version 28
  - prepartion for 29 with zstd but untested.

java/org/artisanlogiciel/games/minetest/net/ConnectionEvent.java

@@ -0,0 +1,45 @@
+package org.artisanlogiciel.games.minetest.net;
+
+public class ConnectionEvent {
+
+    ConnectionEventType m_event_type;
+    int m_peer_id;
+    byte[] m_data;
+    boolean m_timeout;
+
+
+    ConnectionEvent(ConnectionEventType eventType)
+    {
+        m_event_type = eventType;
+    }
+
+    String describe()
+    {
+        return m_event_type.toString();
+    }
+
+    ConnectionEventPtr create(ConnectionEventType type)
+    {
+        return null;
+    }
+
+	ConnectionEventPtr dataReceived(int peer_id, byte[] data)
+    {
+        return null;
+    }
+
+    ConnectionEventPtr peerAdded(int peer_id, Address address)
+    {
+        return null;
+    }
+
+    ConnectionEventPtr peerRemoved(int peer_id, boolean is_timeout, Address address)
+    {
+        return null;
+    }
+
+	ConnectionEventPtr bindFailed()
+    {
+        return null;
+    }
+}