v3: Add PeerConnection.GracefulClose

[edaniels]

Running tests

[codecov]

Codecov Report

Attention: Patch coverage is 75.92593% with 26 lines in your changes missing coverage. Please review.

Project coverage is 80.15%. Comparing base (b8d3a7b) to head (4715107).

Files	Patch %	Lines
datachannel.go	67.64%	7 Missing and 4 partials ⚠️
operations.go	83.33%	4 Missing and 1 partial ⚠️
icegatherer.go	60.00%	2 Missing and 2 partials ⚠️
icetransport.go	81.81%	1 Missing and 1 partial ⚠️
internal/mux/mux.go	0.00%	2 Missing ⚠️
peerconnection.go	90.47%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #2854      +/-   ##
==========================================
- Coverage   80.26%   80.15%   -0.11%     
==========================================
  Files          78       78              
  Lines        7504     7599      +95     
==========================================
+ Hits         6023     6091      +68     
- Misses       1054     1072      +18     
- Partials      427      436       +9     

Flag	Coverage Δ
go	80.15% <75.92%> (-0.11%)	⬇️

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