variable_name, constraint_name in solve_mcp

[chkwon]

Supporting variable_name and constraint_name for output in PATH.

function solve_mcp(
    F::Function,
    J::Function,
    lb::Vector{Cdouble},
    ub::Vector{Cdouble},
    z::Vector{Cdouble};
    nnz::Int = length(lb)^2,
    variable_name::Vector{String}=String[],
    constraint_name::Vector{String}=String[],
    silent::Bool = false,
    kwargs...
)

Not sure how this can be handled in MOI.

[codecov[bot]]

Codecov Report

Merging #48 (f048179) into master (6d8c668) will decrease coverage by 2.57%. The diff coverage is 65.21%.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   94.65%   92.07%   -2.58%     
==========================================
  Files           3        3              
  Lines         243      265      +22     
==========================================
+ Hits          230      244      +14     
- Misses         13       21       +8     

Impacted Files	Coverage Δ
src/C_API.jl	89.09% <65.21%> (-3.92%)	:arrow_down:

---

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[odow]

At the very least, we didn't crash the binaries, so it seems okay.