feat: add Boltzmann selection operator #83
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Description
Added first implementation of Boltzmann selection operator.
Linked issues
Resolves #39
Important implementation details
General note to all operators implemented up to now: take notice that some of them work only when fitness is guaranteed to be >= 0 which is not always the case. This must be carefully documented and we should consider checking this invariant at runtime. (Roulette Wheel, Universal sampling...)
This implementation is inspired by article by Michael de la Maza "The Boltzmann selection Procedure" and "Introduction to Genetic Algorithms" book by S. N. Sivanandam & S. N. Deepa.
It takes initial temperature (tolerance) as a parameter & also uses information of generation number and some additional parameters.