Auth : SSR, Polyfill

[romainquellec]

Is your feature request related to a problem? Please describe.
#1770
Next, Nuxt, and SSR solutions are more and more common.

Describe the solution you'd like
A working Auth solution for server side and client side.

Describe alternatives you've considered
It's hard to get a complete auth solution only for client side (but possible).

Additional context
I dont upgrade my version often, but it seems that the polyfill is sometimes here, sometimes not.
window variable breaks a lot of things server side. It's not a viable solution.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[ericclemmons]

Closed via #6146 (SSR support).

Amplify works with Next.js!

[github-actions]

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