Make Amplify datastore Nextjs friendly

[mdegrees]

Is your feature request related to a problem? Please describe.
Making an SSR page using Nextjs implies getting the initial state server side using getInitialProps helper function. With Amplify dataStore there seems to be no way to get the initial app state server side.

Describe the solution you'd like
Ideally being able to call datastore.query inside getInitialProps (server side).

Additional context
From Amplify datastore documentation it says :

The Sync Engine will run a GraphQL query on first start that hydrates the Storage Engine from the network using a Base Query.

Maybe make use of what @dabit3 did with AppSync https://github.com/dabit3/next-apollo-appsync/blob/master/src/withData.js

[simpleshadow]

See #1613.

[ericclemmons]

This has been addressed as part of #6146!

Please see my synopsis on changes here: #5435 (comment)

Internally, DataStore won't run the sync engine when on the server: instead it will get all the data it needs to satisfy DataStore.query(...) and return it. No subscriptions needed :)

[github-actions]

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