title: How to represent interface implementation in proto file
body: <p>I am using protogen tool to generate c# classes from .proto files. I was wondering whether there is a possibility to represent interface implementation in a proto file. For example, is there any way to represent below in proto file. </p>
  
  <pre><code>interface ILog
  {
  
  }
  
  class ConsoleLog: ILog
  {
  
  }
  </code></pre>