feat: use traceparent header from incoming shape requests to set parent span

[KyleAMathews]

Fix https://github.com/electric-sql/electric/issues/1914

AI-written so YMMV. But works on my machine.

• https://github.com/open-telemetry/opentelemetry-erlang/discussions/518

[netlify[bot]]

✅ Deploy Preview for electric-next ready!

Name	Link
🔨 Latest commit	6b0018c94273b579ffad0bb74e39bb5fb354502c
🔍 Latest deploy log	https://app.netlify.com/sites/electric-next/deploys/673dedf5bbaf850008080957
😎 Deploy Preview	https://deploy-preview-2000--electric-next.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.

[KyleAMathews]

@icehaunter still is working 🫡