Netty PlatformDependent0.<init> uses DirectByteBuffer reflectively

Since we moved `io.netty.util.internal.PlatformDependent`'s and
`io.netty.util.internal.PlatformDependent0`' initialization at runtime
we need to register `java.nio.DirectByteBuffer`'s constructors for
reflective access to avoid miss-configurations due to not being able to
access the constructor in
https://github.com/netty/netty/blob/5db037beedca8aa5b6a486fa515cc6af013ced74/common/src/main/java/io/netty/util/internal/PlatformDependent0.java#L290-L292

More classes and methods need to be registered as discussed in
quarkusio#37626

Closes Karm/mandrel-integration-tests#236

extensions/netty/deployment/src/main/java/io/quarkus/netty/deployment/NettyProcessor.java

@@ -94,6 +94,10 @@ NativeImageConfigBuildItem build(
                 .produce(ReflectiveClassBuildItem.builder("java.util.LinkedHashMap").build());
         reflectiveClass.produce(ReflectiveClassBuildItem.builder("sun.nio.ch.SelectorImpl").methods().fields().build());
 
+        // Setup reflective accesses happening in PlatformDependent0 static initializer
+        reflectiveClass.produce(ReflectiveClassBuildItem.builder("java.nio.DirectByteBuffer").constructors().build());
+
+
         String maxOrder = calculateMaxOrder(config.allocatorMaxOrder, minMaxOrderBuildItems, false);
 
         NativeImageConfigBuildItem.Builder builder = NativeImageConfigBuildItem.builder()