Add NextAuth support to ssx-react

[skgbafa]

Description

This PR adds support for NextAuth to ssx-react and a corresponding example (ssx-test-nextauth). This PR touches a lot of things! Changes include creating new packages, refactoring ssx-server, and updating ssx-react. Some of the changes were made while debugging next stuff, but were not the eventual solution. I left them in for refactor purposes. I'll highlight them! Please comment on any refactor changes as well as new packages.

Updated packages:

• ssx-core
• ssx-server
• ssx-react

New Packages

• ssx-server-middleware

Type

• New feature (non-breaking change which adds functionality)

Diligence Checklist

• This change requires a documentation update
• I have included unit tests
• I have updated and/or included new integration tests
• I have updated and/or included new end-to-end tests
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[Juliano1612]

Since this is an implementation for NextAuth, not Next in general, shouldn't we change references to NextAuth? Example: ssx-react/next/frontend -> ssx-react/next-auth/frontend

[w4ll3]

Changes seems good, all we need now is to fix the CI

[Juliano1612]

Looks good to me!