made chunk size a global shared parameter between the server and the cache backends

rbcs-api/src/main/java/net/woggioni/rbcs/api/CacheHandlerFactory.java

@@ -8,6 +8,7 @@ import io.netty.channel.socket.SocketChannel;
 
 public interface CacheHandlerFactory extends AsyncCloseable {
     ChannelHandler newHandler(
+            Configuration configuration,
             EventLoopGroup eventLoopGroup,
             ChannelFactory<SocketChannel> socketChannelFactory,
             ChannelFactory<DatagramChannel> datagramChannelFactory

rbcs-api/src/main/java/net/woggioni/rbcs/api/Configuration.java

@@ -39,6 +39,7 @@ public class Configuration {
         Duration readIdleTimeout;
         Duration writeIdleTimeout;
         int maxRequestSize;
+        int chunkSize;
     }
 
     @Value