DNS-over-HTTP3

[rthalley]

This is a draft of direct support of DNS-over-HTTP/3 by calling into aioquic while we're waiting for httpx to add support.

[rthalley]

While working on the typing, I discovered a bug in the type signature for https(). It had family: Optional[int] = socket.AF_UNSPEC but the right type is family: int = socket.AF_UNSPEC and this is what was documented. I just fixed this as I don't think anyone would be passing None here, but if people think I should allow None and map it to socket.AF_UNSPEC for maximum backwards compatibility, let me know!

[codecov-commenter]

Codecov Report

Attention: 77 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (main@41b991e). Click here to learn what that means.

Files	Patch %	Lines
dns/query.py	58.57%	16 Missing and 13 partials ⚠️
dns/asyncquery.py	75.00%	5 Missing and 7 partials ⚠️
dns/quic/_asyncio.py	70.27%	5 Missing and 6 partials ⚠️
dns/quic/_sync.py	79.24%	4 Missing and 7 partials ⚠️
dns/quic/_trio.py	72.72%	3 Missing and 6 partials ⚠️
dns/quic/_common.py	89.79%	3 Missing and 2 partials ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1048   +/-   ##
=======================================
  Coverage        ?   93.71%           
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  Files           ?      142           
  Lines           ?    13381           
  Branches        ?     2605           
=======================================
  Hits            ?    12540           
  Misses          ?      494           
  Partials        ?      347           

Flag	Coverage Δ
unittests	93.67% <73.37%> (?)

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