Keep track of residuals in IterState, adapted GaussNewton accordingly

[gmilleramilar]

I took a stab at updating the definition of IterState to support a fix for #342. Library builds. Tests likely don't build. I currently don't have the ability to build the tests.

[stefan-k]

Thanks a lot for your work, I really appreciate it! Changes like these are quite a chore! I have only a few minor comments. Unfortunately the changes I am requesting are also a lot of chore :/

Feel free to get in touch if something isn't clear.

[stefan-k]

CG actually has residuals. Updating this to use the residual in IterState could be a good additional test bed, but it can also be skipped for this PR.

[gmilleramilar]

Yup, I think I get it all. I have it in progress. Unfortunately I'll be offline until mid-next-week, FYI.

[stefan-k]

I currently don't have the ability to build the tests.

Are you on Windows? Tests require netlib which isn't available on Windows. A fix is described in #234 (comment) .

[stefan-k]

I tried to fix the conflicts with main in order to get the CI to run again because all the old logs were already deleted.

[codecov-commenter]

Codecov Report

Attention: 32 lines in your changes are missing coverage. Please review.

Comparison is base (852f6a2) 90.25% compared to head (f7ce247) 90.23%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
argmin/src/core/solver.rs	33.33%	4 Missing ⚠️
argmin/src/solver/brent/brentroot.rs	0.00%	4 Missing ⚠️
argmin/src/solver/quasinewton/sr1.rs	70.00%	3 Missing ⚠️
argmin/src/solver/quasinewton/sr1_trustregion.rs	70.00%	3 Missing ⚠️
argmin/src/solver/simulatedannealing/mod.rs	57.14%	3 Missing ⚠️
argmin/src/solver/trustregion/steihaug.rs	62.50%	3 Missing ⚠️
...rgmin/src/solver/trustregion/trustregion_method.rs	57.14%	3 Missing ⚠️
argmin/src/core/state/iterstate.rs	98.63%	2 Missing ⚠️
argmin/src/solver/linesearch/hagerzhang.rs	60.00%	2 Missing ⚠️
...n/src/solver/gaussnewton/gaussnewton_linesearch.rs	66.66%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #343      +/-   ##
==========================================
- Coverage   90.25%   90.23%   -0.02%     
==========================================
  Files         141      141              
  Lines       19679    19778      +99     
==========================================
+ Hits        17761    17847      +86     
- Misses       1918     1931      +13     

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