Allow passing line search algorithm to pathfinder.

[ColCarroll]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e0f107f) 99.15% compared to head (f35d5ef) 99.15%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #592      +/-   ##
==========================================
- Coverage   99.15%   99.15%   -0.01%     
==========================================
  Files          50       50              
  Lines        2252     2251       -1     
==========================================
- Hits         2233     2232       -1     
  Misses         19       19              

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[junpenglao]

Thanks! Could you do **lbfgs_kwargs instead?

[junpenglao]

Unless those kwargs have different default compare to what currently in jaxopt (which IIRC that's why we have them explicit in the first place)