[CSM] Add event on_place_node API lua (#5548)

* [CSM] Add event on_place_node API lua

clientmods/preview/init.lua

@@ -10,6 +10,13 @@ core.register_on_connect(function()
 	print("[PREVIEW] Player connection completed")
 end)
 
+core.register_on_placenode(function(pointed_thing, node)
+	print("The local player place a node!")
+	print("pointed_thing :" .. dump(pointed_thing))
+	print("node placed :" .. dump(node))
+	return false
+end)
+
 -- This is an example function to ensure it's working properly, should be removed before merge
 core.register_on_receiving_chat_messages(function(message)
 	print("[PREVIEW] Received message " .. message)