BETA: new feature: dns-over-tls record validation

Hi folks!

This is pre-release because not all features for dns-over-tls has been implemented. Stay tuned!

What actually changed:

• this and future releases by default requires openssl, but you can get rid of it
• small fix for parallel iterators - removed one collect. Should be faster then.
• validate your records for ip or cname by dns-over-tls with dnseec, controlled by cli arg --dns [yes/no] default no

Note that:

• For some reason dot queries are slow... Like ~600 records per 1.5 minute. Needs investigation
• There are inbuilt non-logging, uncensored, privacy friendly dot servers +(cloudflare and quad9), 16 in total.
• /etc/resolv.conf or any other system dns conf is not respected
• Regression with DragonflyBSD builds, as trust-dns-resolver bumped msrv

Full release will contain:

• User-defined dot servers
• Query speedup (hopefully)
• New option for only log-generating while dns validation, without rejecting.