Add IPv6 Test

[Sean-Der]

If IPv6 is supported assert that Pion can connect via it.

Resolves #1315

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.74%. Comparing base (43c27b7) to head (e7578fc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3088      +/-   ##
==========================================
+ Coverage   78.67%   78.74%   +0.07%     
==========================================
  Files          91       91              
  Lines       11337    11337              
==========================================
+ Hits         8919     8927       +8     
+ Misses       1930     1923       -7     
+ Partials      488      487       -1     

Flag	Coverage Δ
go	80.65% <ø> (+0.07%)	⬆️
wasm	63.84% <ø> (ø)

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