enhance(graphql): simplify graphql handler

[ardatan]

Simplify GraphQL handler by following AWS Lambda recipe of Yoga;

https://github.com/dotansimha/graphql-yoga/blob/master/examples/aws-lambda/lambda/graphql.ts#L7

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[jtoar]

Thanks @ardatan!

@dac09, @dthyresson could I assign this one to either of you (or both)? And is this important to get in as a fix soon or can take its time? (Assuming the latter)

[jtoar]

Sorry for losing this one @ardatan I'll bring this one up at our standup this week.