title: JsonSerializer - serialize decimal places with 'N2' formatting
body: <p>I'm serializing decimals using Newtonsoft.Json.JsonSerializer.</p>
  
  <p>How can I set it to serialize decimal numbers with only 1 decimal place to use 0 at the end.</p>
  
  <p>i.e. 3.5 serializes to "3.50"?</p>