Use track id in get_stats

[roznawsk]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.93%. Comparing base (217519f) to head (f6d8a45).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/ex_webrtc/rtp_sender.ex	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
+ Coverage   87.80%   87.93%   +0.13%     
==========================================
  Files          47       47              
  Lines        2370     2371       +1     
==========================================
+ Hits         2081     2085       +4     
+ Misses        289      286       -3     

Files with missing lines	Coverage Δ
lib/ex_webrtc/rtp_receiver.ex	76.92% <ø> (ø)
lib/ex_webrtc/rtp_sender.ex	91.37% <0.00%> (+0.15%)	⬆️

... and 2 files with indirect coverage changes

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[mickel8]

Track attached to the sender can be changed without creating a new sender (using replaceTrack function). I think we can store track id in a new field called mediaSourceId, see here

Could you also add trackIdentifier to the receiver stats?