Add ConstraintBasisStatus

[odow]

Closes #113

[codecov]

Codecov Report

Merging #116 (dedc84a) into master (932bb56) will increase coverage by 1.33%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master     #116      +/-   ##
==========================================
+ Coverage   54.32%   55.66%   +1.33%     
==========================================
  Files           3        3              
  Lines         624      636      +12     
==========================================
+ Hits          339      354      +15     
+ Misses        285      282       -3     

Impacted Files	Coverage Δ
src/MOI_wrapper/MOI_wrapper.jl	90.33% <92.85%> (+0.11%)	⬆️
src/gen/libclp_api.jl	18.15% <0.00%> (+0.77%)	⬆️

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