instantiate a MathOptNLPModel during `bmark_solver`

[codecov[bot]]

Codecov Report

Base: 77.63% // Head: 77.70% // Increases project coverage by +0.06% :tada:

Coverage data is based on head (cde8e0d) compared to base (c314a0c). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #137 +/- ## ========================================== + Coverage 77.63% 77.70% +0.06% ========================================== Files 13 13 Lines 322 323 +1 ========================================== + Hits 250 251 +1 Misses 72 72 ``` | [Impacted Files](https://codecov.io/gh/JuliaSmoothOptimizers/SolverBenchmark.jl/pull/137?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers) | Coverage Δ | | |---|---|---| | [src/SolverBenchmark.jl](https://codecov.io/gh/JuliaSmoothOptimizers/SolverBenchmark.jl/pull/137?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL1NvbHZlckJlbmNobWFyay5qbA==) | `100.00% <ø> (ø)` | | | [src/run\_solver.jl](https://codecov.io/gh/JuliaSmoothOptimizers/SolverBenchmark.jl/pull/137?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL3J1bl9zb2x2ZXIuamw=) | `82.92% <100.00%> (+0.42%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers)

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