[WIP] Add support for server-side authentication with Next.js App Router

[xixixao]

Also removes refresh tokens and refresh token reuse detection for a simpler approach with bare session IDs.

TODO:

• [x] Check Origin header before returning cookies
  • ~[ ] And allow skipping the check for CORS support~ Not gonna support for now
• [x] Write docs on handling XSS
• [ ] Require the next version of Convex with web socket pausing for token fetching

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
convex-auth-docs	✅ Ready (Inspect)	Visit Preview	💬 1 unresolved ✅ 4 resolved	Aug 2, 2024 1:15pm

[xixixao]

Already merged on main.