[PR] Extended Callbacks Methods

[rodrigo-arenas]

This PR implements what is described on issue #52, it adds the methods on_start and on_end for the Callbacks. Now the evaluation process looks like this:

• As consequence of this new logic, the TimerStopping callbacks starts the timer using on_start instead of calculating this inside the GASearchCV itself.

• The Callbacks are not longer evaluated using the __call__ method, but one of on_start, on_step or on_end according to the current state of the algorithm.

• All the docs and tests are updated to reflect this new logic.

[codecov[bot]]

Codecov Report

Merging #54 (8012aa7) into master (86034f3) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #54   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines          632       669   +37     
=========================================
+ Hits           632       669   +37     

Impacted Files	Coverage Δ
sklearn_genetic/genetic_search.py	100.00% <ø> (ø)
sklearn_genetic/algorithms.py	100.00% <100.00%> (ø)
sklearn_genetic/callbacks/__init__.py	100.00% <100.00%> (ø)
sklearn_genetic/callbacks/base.py	100.00% <100.00%> (ø)
sklearn_genetic/callbacks/early_stoppers.py	100.00% <100.00%> (ø)
sklearn_genetic/callbacks/loggers.py	100.00% <100.00%> (ø)
sklearn_genetic/callbacks/validations.py	100.00% <100.00%> (ø)
sklearn_genetic/parameters.py	100.00% <100.00%> (ø)

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