Consider adding Clarabel solver to the benchmarks

[nrontsis]

Clarabel is a new solver that was shown to be competitive in some QP problems of mine.

See related discussion here and related talk here.

[stephane-caron]

Thanks for pointing out this solver 👍 Tracking its integration in qpsolvers/qpsolvers#173 then #47.

[nrontsis]

Thanks! 🙌