add driftpixel Adapter

[driftpixelai]

🏷 Type of documentation

• [x] new bid adapter

📋 Checklist

• [x] Related pull requests in prebid.js or server are linked -> Paste link in this list or reference it on the PR itself
• [x] For new adapters check submitting your adapter docs

[netlify[bot]]

✅ Deploy Preview for prebid-docs-preview ready!

Name	Link
🔨 Latest commit	5b00e084aff9abb25f087fdf0acccc58b85643f1
🔍 Latest deploy log	https://app.netlify.com/sites/prebid-docs-preview/deploys/6658c97fe1046f00086ae5ff
😎 Deploy Preview	https://deploy-preview-5302--prebid-docs-preview.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[bretg]

part of 8.50