add example GraphQL server and client that use @defer

[gabbigum]

Improvement of examples documentation.

What led to this PR: graphql/graphql-js#3291

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[saihaj]

@IvanGoncharov @robrichard can you please review and merge this

[acao]

awesome! we have stream and defer examples in graphiql as well.

it doesn't work yet with netlify, or we need to configure our netlify function to handle multipart better, it seems to send all the chunks at once sync. but if you run this same query with the local server and express-graphql it just works!

https://graphiql-test.netlify.app/?query=query%20%7B%0A%20%20streamable(delay%3A%201000)%20%40stream(initialCount%3A%202)%20%7B%0A%20%20%20%20text%0A%20%20%7D%0A%7D&operationName=Example

[acao]

@gabbigum you'll need to sign the CLA. thanks for this PR!

[gabbigum]

I signed the CLA. Thanks :)

[gabbigum]

awesome! we have stream and defer examples in graphiql as well.

it doesn't work yet with netlify, or we need to configure our netlify function to handle multipart better, it seems to send all the chunks at once sync. but if you run this same query with the local server and express-graphql it just works!

https://graphiql-test.netlify.app/?query=query%20%7B%0A%20%20streamable(delay%3A%201000)%20%40stream(initialCount%3A%202)%20%7B%0A%20%20%20%20text%0A%20%20%7D%0A%7D&operationName=Example

Can you send me examples of @defer with graphiql. It would help me a lot.