feat: pass res to contextResolver

This will enable us to use the response object in the function that creates the context. This can for example be used to bind (logging) events with `res.once('finish', () => {})`

server/initialize.js

@@ -90,7 +90,7 @@ function getContextCreator(meteorApolloConfig, initialApolloConfig) {
   } = initialApolloConfig;
 
   const baseContext = { db };
-  return async function getContext({ req: request, connection }) {
+  return async function getContext({ req: request, res, connection }) {
     // This function is called whenever a normal graphql request is being made,
     // as well as when a client initiates a new subscription. However, when a
     // client subscribes, the request headers are not being send along. The
@@ -112,6 +112,7 @@ function getContextCreator(meteorApolloConfig, initialApolloConfig) {
     const defaultContext = defaultContextResolver
       ? await defaultContextResolver({
           req,
+          res,
           connection,
           ...baseContext,
           ...userContext,