Feature request: recursive resolving (over plaintext)

[qdm12]

This cannot be achieved with DoT or DoH for now, and must be through plaintext DNS which sucks. But it would be interesting to offer the option though.

• Add plaintext DNS server
• Add recursive resolving for a *net.Resolver
• Add recursive resolving for a DNS handler / server
• Hardcode root hints (root nameservers addresses) + addresses of TLD nameservers
• Add DNSSEC support

Recursive resolving works by querying NS records from the root zone . downwards until reaching the target zone, and then querying the desired rrset/rrsig on the final nameserver. You can use for example dig +trace qqq.ninja. to follow the recursive resolving.