Include DataChannel stats in PeerConnection.get_stats

[LVala]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.73%. Comparing base (8109856) to head (8db9248).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/ex_webrtc/sctp_transport.ex	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
+ Coverage   87.49%   87.73%   +0.23%     
==========================================
  Files          40       40              
  Lines        2199     2225      +26     
==========================================
+ Hits         1924     1952      +28     
+ Misses        275      273       -2     

Files with missing lines	Coverage Δ
lib/ex_webrtc/peer_connection.ex	86.20% <100.00%> (+0.35%)	⬆️
lib/ex_webrtc/sctp_transport.ex	82.63% <92.59%> (+1.38%)	⬆️

... and 2 files with indirect coverage changes

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