Add custom selection

[YamLyubov]

Now useres can set custom selection function of type custom_selection(populattion: PopulationT, pop_size: int]) -> PopulationT

240

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (085ca3d) 71.91% compared to head (837b653) 71.93%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #249 +/- ## ========================================== + Coverage 71.91% 71.93% +0.02% ========================================== Files 136 136 Lines 8140 8143 +3 ========================================== + Hits 5854 5858 +4 + Misses 2286 2285 -1 ```

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