title: Use decimalformat in slf4j or logback to pad or ident numbers so they align right
body: <p>I have this log statement in SLF4J (with Logback below it):</p>
  
  <pre><code>        logger.info("{} has {} depots, {00} vehicles and {} customers with a search space of {}.", ...);
  </code></pre>
  
  <p>And I get this output:</p>
  
  <pre><code>A-n62-k8 has 1 depots, 8 vehicles and 61 customers with a search space of 10^108.
  A-n63-k10 has 1 depots, 10 vehicles and 62 customers with a search space of 10^111.
  </code></pre>
  
  <p>But I want this output, which add extra space padding/indentation:</p>
  
  <pre><code>A-n62-k8  has 1 depots,  8 vehicles and 61 customers with a search space of 10^108.
  A-n63-k10 has 1 depots, 10 vehicles and 62 customers with a search space of 10^111.
  </code></pre>
  
  <p>Is this possible with SLF4J?</p>