Move functions modyfing RTPSender out of PeerConnection

[LVala]

No description provided.

[codecov]

Codecov Report

Merging #75 (c6d3d52) into master (f96e563) will increase coverage by 0.02%.
The diff coverage is 80.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   88.41%   88.43%   +0.02%     
==========================================
  Files          29       29              
  Lines        1303     1306       +3     
==========================================
+ Hits         1152     1155       +3     
  Misses        151      151              

Files	Coverage Δ
lib/ex_webrtc/peer_connection.ex	87.52% <100.00%> (+0.43%)	⬆️
lib/ex_webrtc/rtp_transceiver.ex	94.05% <76.47%> (-3.56%)	⬇️

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