Include ufrag extension

[JoeTurki]

Description

Include ufrag extension in the ICE candidates generated by the ICE agent

Reference issue

Fixes #757
based on: #758

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.

Project coverage is 78.66%. Comparing base (141df5a) to head (d21ae5e).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
agent.go	66.66%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #759      +/-   ##
==========================================
+ Coverage   78.63%   78.66%   +0.03%     
==========================================
  Files          41       41              
  Lines        5358     5367       +9     
==========================================
+ Hits         4213     4222       +9     
  Misses        915      915              
  Partials      230      230              

Flag	Coverage Δ
go	78.66% <66.66%> (+0.03%)	⬆️
wasm	27.42% <0.00%> (-0.05%)	⬇️

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