feat: Make http error response RFC compliant

Currently, purista returns proper json error messages, but they do not fully follow an official standard.
Because PURISTA is enterprise focused, we should adapt the 
https://www.rfc-editor.org/rfc/rfc9457.html

we should also consider to follow cloudflares approach:
https://blog.cloudflare.com/rfc-9457-agent-error-pages/