feat: pass res to contextResolver

[smeijer]

I've exposed the response object to the context creator. This enables me to log events once the request has been completed.

I use this to log response times:

initialize({
  context: async ({ req, res }) => {
    const start = new Date().getTime();

    res.once('finish', () => {
      const duration = Date.now() - start;
      console.log(`graphql request took ${duration}ms`);
    });

    return { ... };
  }
});

[theodorDiaconu]

Released 0.10.1