Fix the pickle error when dumping an estimator

[imxtx]

This fix #83. When saving an estimator, the dump method will report an error due to module class members and lambda functions.

Solved two issues:

1. Pickle does dot support dumping module objects. There is no need to put the creator as a class member of GASearchCV and GAFeatureSelectionCV.
2. Lambda creates anonymous function objects that don't have names and can't be found by the pickle loader. See https://stackoverflow.com/a/72339613.

[codecov[bot]]

Codecov Report

Merging #140 (94d0435) into master (7e62418) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #140   +/-   ##
=======================================
  Coverage   98.42%   98.42%           
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  Files          25       25           
  Lines        1016     1016           
=======================================
  Hits         1000     1000           
  Misses         16       16           

Files Changed	Coverage Δ
sklearn_genetic/genetic_search.py	98.60% <100.00%> (ø)

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[imxtx]

cool，I will update it later.

                Tianxin Xie

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---- Replied Message ----FromRodrigo @.>Date09/20/2023 00:41 @.> CcT.X. @.>@.>SubjectRe: [rodrigo-arenas/Sklearn-genetic-opt] Fix the pickle error when dumping an estimator (PR #140) @rodrigo-arenas requested changes on this pull request.

hI @imxtx It looks good, the only change I'd request is to rename the function from getter_fittness_values to ind_fitness_values, just to a keep track of the names from the DEAP package Thanks!

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