Support IPv6 from mDNS

[edaniels]

No description provided.

[Sean-Der]

@edaniels Would it possible to limit this just to mDNS for now?

I would love to see these other things fixed, but as unique efforts/PRs.

The Mux setup in ICE in particular needs evaluated. We have 3 different UDP Mux's I believe, and they all have different issues. Before we break any APIs I would like to understand them all and do one clean break!

[edaniels]

@edaniels Would it possible to limit this just to mDNS for now?

I would love to see these other things fixed, but as unique efforts/PRs.

The Mux setup in ICE in particular needs evaluated. We have 3 different UDP Mux's I believe, and they all have different issues. Before we break any APIs I would like to understand them all and do one clean break!

I want to say yes but let's see what breaks when I undo those changes in this PR. They must have happened in combination with a TCP mux plus mDNS tests. If they don't break, I'll keep it undone. If they do, I'll see if I can create a temporary hidden interface that is an experimental API that works for the mixed implemented in the pkg!

[codecov]

Codecov Report

Attention: Patch coverage is 74.13333% with 97 lines in your changes are missing coverage. Please review.

Project coverage is 78.75%. Comparing base (ae1ba6f) to head (8af8f9c).

Files	Patch %	Lines
gather.go	62.16%	21 Missing and 7 partials ⚠️
addr.go	63.01%	20 Missing and 7 partials ⚠️
agent.go	65.78%	7 Missing and 6 partials ⚠️
mdns.go	78.18%	9 Missing and 3 partials ⚠️
candidate_base.go	72.72%	2 Missing and 1 partial ⚠️
candidate_host.go	75.00%	1 Missing and 1 partial ⚠️
candidate_peer_reflexive.go	60.00%	1 Missing and 1 partial ⚠️
candidate_relay.go	85.71%	1 Missing and 1 partial ⚠️
candidate_server_reflexive.go	85.71%	1 Missing and 1 partial ⚠️
net.go	94.73%	1 Missing and 1 partial ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #660      +/-   ##
==========================================
+ Coverage   78.56%   78.75%   +0.19%     
==========================================
  Files          42       42              
  Lines        4487     4698     +211     
==========================================
+ Hits         3525     3700     +175     
- Misses        740      767      +27     
- Partials      222      231       +9     

Flag	Coverage Δ
go	78.75% <74.13%> (+0.19%)	⬆️
wasm	22.48% <14.93%> (?)

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