Use instrospectSchema

[ptpaterson]

It is possible to use introspectSchema.

It seems that the lambda is returning early before graphql server handler can act, when I try to use async/await. It worked when using Promises instead.

how latency increased by a lot because my caching of schema is not working -- it's fetching remote schema on every request. This really increased the latency of the functions.

This latency issue should be resolved before merging introspection.