Logging with CF Ray header

[robertu7]

refs:

• https://github.com/thematters/matters-server/blob/f60e8019dbb4e8a0ea8e8f345e9d8d170f0393cf/src/index.ts
• #3347
• https://developers.cloudflare.com/support/troubleshooting/general-troubleshooting/gathering-information-for-troubleshooting-sites/#add-the-cf-ray-header-to-your-logs