Add more kwargs (opt_alg and verbose) to FSBP operators

[JoshuaLampert]

Sometimes it can be better to use another optimization algorithm from Optim.jl than LBFGS (I have seen that BFGS sometimes outperforms LBFGS significantly). In order to easily switch between solvers, I added a kwarg to set the solver. In addition, I often want to inspect the result of the optimization procedure. To do this more easily I also added another kwarg verbose to display the result.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.17%. Comparing base (8080cf4) to head (6015322).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #279   +/-   ##
=======================================
  Coverage   91.16%   91.17%           
=======================================
  Files          35       35           
  Lines        5311     5312    +1     
=======================================
+ Hits         4842     4843    +1     
  Misses        469      469           

Flag	Coverage Δ
unittests	91.17% <100.00%> (+<0.01%)	⬆️

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[ranocha]

Thanks!

[coveralls]

coverage: 91.992% (+0.001%) from 91.991%
when pulling 6015322 on JoshuaLampert:more-kwargs-fsbp
into 8080cf4 on ranocha:main.