Copy benchmark sample

CopyBenchSample.java

@GenerateMicroBenchmark
public Object copyFieldByFieldGetFieldsEveryTime() {
    return FieldsCopy.INSTANCE.copy();
}

@GenerateMicroBenchmark
public Object copyFieldByFieldUseCacheFields() {
    return CachedFieldsCopy.INSTANCE.copy();
}

@GenerateMicroBenchmark
public Object copyByClone() {
    return CloneCopy.INSTANCE.copy();
}