DataChannels: allow for closing, apply negotiated stream parameters

[LVala]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 70.21277% with 14 lines in your changes missing coverage. Please review.

Project coverage is 87.58%. Comparing base (637f2d7) to head (b6734af).
Report is 1 commits behind head on master.

Files	Patch %	Lines
lib/ex_webrtc/sctp_transport.ex	65.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
- Coverage   87.82%   87.58%   -0.24%     
==========================================
  Files          40       40              
  Lines        2160     2199      +39     
==========================================
+ Hits         1897     1926      +29     
- Misses        263      273      +10     

Files	Coverage Δ
lib/ex_webrtc/peer_connection.ex	85.84% <100.00%> (+0.14%)	⬆️
lib/ex_webrtc/sctp_transport.ex	81.25% <65.00%> (-3.58%)	⬇️

... and 1 file with indirect coverage changes

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