New TerminationReason definition

[relf]

This PR implements a new version of TerminationReason enum as discussed here.

It introduces the variant SolverExit(String) which allows to define custom stopping reason and SolverConverged which is intended to gather all successful exit reasons under the same umbrella.

Some unwanted implementation consequences:

• TerminationReason is not Copy anymore (TerminationStatus as well)
• We "loose" information when several successful exits are possible for a solver

[codecov-commenter]

Codecov Report

Base: 93.39% // Head: 93.36% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (41cbaca) compared to base (1caaf44).
Patch coverage: 58.46% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #316      +/-   ##
==========================================
- Coverage   93.39%   93.36%   -0.04%     
==========================================
  Files         119      119              
  Lines       19012    18986      -26     
==========================================
- Hits        17756    17726      -30     
- Misses       1256     1260       +4     

Impacted Files	Coverage Δ
argmin/src/core/state/mod.rs	100.00% <ø> (ø)
argmin/src/solver/brent/brentroot.rs	0.97% <0.00%> (ø)
...n/src/solver/gaussnewton/gaussnewton_linesearch.rs	92.69% <0.00%> (ø)
...rgmin/src/solver/gaussnewton/gaussnewton_method.rs	96.52% <0.00%> (ø)
argmin/src/solver/goldensectionsearch/mod.rs	95.29% <0.00%> (ø)
argmin/src/solver/neldermead/mod.rs	94.31% <0.00%> (ø)
argmin/src/solver/quasinewton/sr1.rs	76.50% <0.00%> (ø)
argmin/src/solver/quasinewton/sr1_trustregion.rs	72.25% <0.00%> (ø)
argmin/src/solver/simulatedannealing/mod.rs	85.65% <0.00%> (-0.72%)	⬇️
argmin/src/solver/trustregion/steihaug.rs	60.55% <0.00%> (ø)
... and 12 more

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[stefan-k]

Thanks a lot, I really appreciate all the work!!