Add a Regularized LLSModels

In [RegularizedOptimization.jl](https://github.com/JuliaSmoothOptimizers/RegularizedOptimization.jl), in particular in the LM and LMTR algorithms, we need to model at each iteration
```math
\varphi: s \mapsto \frac{1}{2} \lVert F(x) \rVert_2^2 + (J(x)^T F(x))^T s + \frac{1}{2} \sigma \lVert s \rVert_2^2.
```
We should use this package as a dependency to do so.

Similar issue: https://github.com/JuliaSmoothOptimizers/QuadraticModels.jl/issues/164