title: Optaplanner Logger should also show customer id for each move
body: <p>I am using <code>trace</code> in <code>logback.xml</code>, and have different classes derived from 
  <code>SelectionFilter</code>.</p>
  
  <p>When the <code>moves</code> are <code>traced</code> they are related to the <code>locations IDs</code> of the
  customers. Is it internally possible to use in addition/instead the
  <code>customer IDs</code>, to find out what happens during the moves?</p>