[jvm] Improve NativeOutput performance

[barisyild]

This commit improves NativeOutput performance

POC

var bytes:Bytes = Bytes.alloc(1024 * 1024 * 100);
socket.output.writeInput(new BytesInput(bytes));

Benchmark Results

Before

JVM: 800-1100 kb per second
C++: 200-300 mb per second

After

JVM: 200-300 mb per second
C++: 200-300 mb per second