Add new constructors for mixed models

[tmigot]

• [ ] Need more unit tests to cover ADNLSModel(...)
• [ ] up doc

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06% :tada:

Comparison is base (515bcf3) 95.12% compared to head (0c8fc6a) 95.18%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #202 +/- ## ========================================== + Coverage 95.12% 95.18% +0.06% ========================================== Files 14 14 Lines 1621 1642 +21 ========================================== + Hits 1542 1563 +21 Misses 79 79 ``` | [Files Changed](https://app.codecov.io/gh/JuliaSmoothOptimizers/ADNLPModels.jl/pull/202?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers) | Coverage Δ | | |---|---|---| | [src/nlp.jl](https://app.codecov.io/gh/JuliaSmoothOptimizers/ADNLPModels.jl/pull/202?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL25scC5qbA==) | `99.22% <ø> (ø)` | | | [src/nls.jl](https://app.codecov.io/gh/JuliaSmoothOptimizers/ADNLPModels.jl/pull/202?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL25scy5qbA==) | `98.87% <ø> (ø)` | | | [src/ADNLPModels.jl](https://app.codecov.io/gh/JuliaSmoothOptimizers/ADNLPModels.jl/pull/202?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL0FETkxQTW9kZWxzLmps) | `100.00% <100.00%> (ø)` | |

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[github-actions[bot]]

Package name	latest	stable
CaNNOLeS.jl
DCISolver.jl
DerivativeFreeSolvers.jl
JSOSolvers.jl
NLPModelsIpopt.jl
OptimizationProblems.jl
Percival.jl
QuadraticModels.jl
SolverBenchmark.jl
SolverTools.jl