Make DelegatingBytes.getImpl public to avoid copying

Signed-off-by: Luis Pinto <luis.pinto@consensys.net>

Author: lu-pinto

bytes/src/main/java/org/apache/tuweni/bytes/v2/DelegatingBytes.java

@@ -54,7 +54,7 @@ public String toString() {
   }
 
   @Override
-  Bytes getImpl() {
+  public Bytes getImpl() {
     return delegate.getImpl();
   }