Introduce functional genetic algorithm operators

[engintoklu]

Alternative implementations for genetic algorithm operators are introduced. These alternative implementations conform to the paradigm of functional programming, and they are batchable (via simply adding a leftmost dimension to the population, or via torch.func.vmap).

A custom genetic algorithm can be implemented by combining these operators.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 76.09489% with 131 lines in your changes missing coverage. Please review.

Project coverage is 77.02%. Comparing base (5c58566) to head (27fd934). Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
src/evotorch/operators/functional.py	82.16%	89 Missing :warning:
src/evotorch/core.py	14.28%	36 Missing :warning:
src/evotorch/tools/immutable.py	0.00%	6 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   76.74%   77.02%   +0.27%     
==========================================
  Files          49       58       +9     
  Lines        7509     9017    +1508     
==========================================
+ Hits         5763     6945    +1182     
- Misses       1746     2072     +326     

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