Add channel problem

[tmigot]

#161

[codecov]

Codecov Report

Base: 99.86% // Head: 99.86% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (81f08ee) compared to base (dc07827).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #216   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files         748      751    +3     
  Lines        6639     6730   +91     
=======================================
+ Hits         6630     6721   +91     
  Misses          9        9           

Impacted Files	Coverage Δ
src/ADNLPProblems/ADNLPProblems.jl	100.00% <100.00%> (ø)
src/ADNLPProblems/channel.jl	100.00% <100.00%> (ø)
src/Meta/channel.jl	100.00% <100.00%> (ø)
src/PureJuMP/channel.jl	100.00% <100.00%> (ø)

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