Add Structured Error Data for Filtered DNS

Add support for [Structured Error Data for Filtered DNS](https://datatracker.ietf.org/doc/draft-ietf-dnsop-structured-dns-error/) as browsers will start to support it.

There are also providers like [AdGuard DNS](https://adguard-dns.io/en/blog/adguard-dns-v2-10.html) that already implemented it.