docs: metadata for responses

[ShubhamPalriwala]

What does this PR do?

Adds Documentation for Metadata

Currently added it in the Additional Features since I wasn't exactly sure + will be rearranged in our 2.0 restructuring so this is to keep the velocity going.

Fixes https://github.com/formbricks/internal/issues/97

Tella Video: https://tella.video/shubhams-video-hs0k

Screenshots:

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

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[github-actions]

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

[jobenjada]

added menu item, looks good otherwise! :)