feat: add iteration callback support for scipy+csv

[redeboer]

Closes #237

[codecov]

Codecov Report

Merging #241 (672177b) into master (8d363e2) will decrease coverage by 1.25%.
The diff coverage is 63.41%.

@@            Coverage Diff             @@
##           master     #241      +/-   ##
==========================================
- Coverage   80.57%   79.31%   -1.26%     
==========================================
  Files          12       12              
  Lines         556      585      +29     
  Branches       71       79       +8     
==========================================
+ Hits          448      464      +16     
- Misses         83       90       +7     
- Partials       25       31       +6     

Flag	Coverage Δ
unittests	79.31% <63.41%> (-1.26%)	⬇️

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Impacted Files	Coverage Δ
src/tensorwaves/optimizer/callbacks.py	64.37% <55.88%> (-3.75%)	⬇️
src/tensorwaves/optimizer/scipy.py	93.10% <100.00%> (+0.94%)	⬆️