Cloudfare status codes

Cloudflare seems to be defining a few custom error codes in the 5xx area. Not cool, I know.
https://support.cloudflare.com/hc/en-us/articles/115003011431-Troubleshooting-Cloudflare-5XX-errors

The `StatusCode` enum doesn't contain them, and this causes a panic in the `Response` constructor. https://github.com/http-rs/http-types/blob/main/src/status_code.rs

Is there a plan to add these error codes to the enum or to rework it in such a way that the `Response` constructor doesn't panic?

Read status_code.rs and trace the Response constructor to reproduce how an unsupported Cloudflare 5xx code causes a panic. Done means the handling is changed as agreed—either supported by StatusCode or no longer panics—and covered by the relevant project tests.

Written by the indexing model from the issue text.