HSEARCH-1480 newArrayList helper should mandate a size hint

I'd prefer to have exclusively

    newArrayList(final int size);

as to encourage _thinking_ about a reasonable value, but since we couldn't agree on that I'm just adding this method on top of the existing one. Still I hope we'll all keep in mind to use the one with a size argument when it's possible.

https://hibernate.atlassian.net/browse/HSEARCH-1480