Adding a new "hyper" protocol

[martinheidegger]

While developing hyper-dns I noticed a two things that were problematic:

• No prefix for domains. Learning lessons from dnslink here that uses _dnslink.<name> to look up names initially instead of <name> to support CNAME and ALIAS entries on the main entry. This proposal prefixes domains with hyper-dns because - unfortunately - dnslink's implementations don't support multiple dnslink= text entries per domain. I am not sure how important a fallback to <name> really is, if hyper-dns.<name> is given?
• Immediate well-known lookups. Right now there is no way to tell if a name does not support dat without doing a https request. The vast majority of domains out there do not support dat and looking up those domains may make us seem like a bad actor. The solution proposed in this PR is to only use well-known lookups if a special key is set, specifically hyper=well-known.

[martinheidegger]

After conversations around this yesterday I still need to work on it, some more tests needed.