Several small improvements

[janosg]

• Document how to provide derivatives for nonlinear constraints
• Return more information when the fides optimizers is used
• Fix warnings in tests

solves #409
solves #405

[codecov]

Codecov Report

Merging #412 (8cabec9) into main (8ce1611) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #412   +/-   ##
=======================================
  Coverage   92.86%   92.87%           
=======================================
  Files         223      223           
  Lines       17443    17450    +7     
=======================================
+ Hits        16199    16206    +7     
  Misses       1244     1244           

Impacted Files	Coverage Δ
...timagic/optimization/subsolvers/_steihaug_toint.py	80.89% <ø> (ø)
src/estimagic/optimization/subsolvers/_trsbox.py	84.95% <ø> (ø)
src/estimagic/optimization/tiktak.py	92.63% <ø> (ø)
tests/optimization/subsolvers/test_bntr_fast.py	100.00% <ø> (ø)
tests/optimization/subsolvers/test_gqtpar_fast.py	100.00% <ø> (ø)
...sts/optimization/subsolvers/test_gqtpar_lambdas.py	100.00% <ø> (ø)
src/estimagic/inference/shared.py	99.36% <100.00%> (+<0.01%)	⬆️
src/estimagic/optimization/fides_optimizers.py	93.87% <100.00%> (+0.54%)	⬆️
...gic/optimization/subsolvers/_conjugate_gradient.py	100.00% <100.00%> (ø)
src/estimagic/optimization/subsolvers/bntr.py	87.20% <100.00%> (ø)
... and 2 more

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