feat: shared cache for next caching

[ShubhamPalriwala]

Closes https://github.com/formbricks/internal/issues/54

What does this PR do?

Uses a combination of:

• Redis (for next caching)
• Webdis (HTTP wrapper over redis) (for rate limiting in middleware due to the edge runtime)

A new env var:

REDIS_HTTP_INTERFACE_URL

Checklist

Required

• Filled out the "How to test" section in this PR
• Read How we Code at Formbricks
• Self-reviewed my own code
• Commented on my code in hard-to-understand bits
• Ran pnpm build
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues
• First PR at Formbricks? Please sign the CLA! Without it we wont be able to merge it 🙏

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the Formbricks Docs if changes were necessary

[vercel]

@ShubhamPalriwala is attempting to deploy a commit to the formbricks Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

Thank you for following the naming conventions for pull request titles! 🙏

[mattinannt]

@ShubhamPalriwala thanks :-) looks much better and simpler than before!
A few small points:

[mattinannt]

@ShubhamPalriwala Looks great! Thanks for making the changes :-)