title: Get query/mutation operation name
body: <p>How can I get the operation name in the context? In resolver I can get that with <code>info</code> parameter.</p>
  
  <pre class="lang-js prettyprint-override"><code>import { ApolloServer } from 'apollo-server'
  
  const server = new ApolloServer({
    context: ({ req }) =&gt; {
      // Get query/mutation operation name like getAllUsers
    }
  })
  
  server.listen()
  </code></pre>