Move some solvers to optional deps

[codecov[bot]]

Codecov Report

Patch coverage: 68.54% and project coverage change: -0.35% :warning:

Comparison is base (fcf1b39) 80.09% compared to head (787265a) 79.75%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #112 +/- ## ========================================== - Coverage 80.09% 79.75% -0.35% ========================================== Files 4 7 +3 Lines 206 242 +36 ========================================== + Hits 165 193 +28 - Misses 41 49 +8 ``` | [Files Changed](https://app.codecov.io/gh/JuliaSmoothOptimizers/JSOSuite.jl/pull/112?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers) | Coverage Δ | | |---|---|---| | [src/solvers/knitro\_solve.jl](https://app.codecov.io/gh/JuliaSmoothOptimizers/JSOSuite.jl/pull/112?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL3NvbHZlcnMva25pdHJvX3NvbHZlLmps) | `0.00% <0.00%> (ø)` | | | [src/selection.jl](https://app.codecov.io/gh/JuliaSmoothOptimizers/JSOSuite.jl/pull/112?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL3NlbGVjdGlvbi5qbA==) | `85.48% <42.85%> (-8.64%)` | :arrow_down: | | [src/solvers/ripqp\_solve.jl](https://app.codecov.io/gh/JuliaSmoothOptimizers/JSOSuite.jl/pull/112?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL3NvbHZlcnMvcmlwcXBfc29sdmUuamw=) | `72.41% <72.41%> (ø)` | | | [src/solve.jl](https://app.codecov.io/gh/JuliaSmoothOptimizers/JSOSuite.jl/pull/112?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL3NvbHZlLmps) | `88.88% <88.23%> (+20.52%)` | :arrow_up: | | [src/solvers/ipopt\_solve.jl](https://app.codecov.io/gh/JuliaSmoothOptimizers/JSOSuite.jl/pull/112?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL3NvbHZlcnMvaXBvcHRfc29sdmUuamw=) | `96.00% <96.00%> (ø)` | | | [src/JSOSuite.jl](https://app.codecov.io/gh/JuliaSmoothOptimizers/JSOSuite.jl/pull/112?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers#diff-c3JjL0pTT1N1aXRlLmps) | `94.11% <100.00%> (+3.64%)` | :arrow_up: |

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