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Add implementation of binary exponentiation #80

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Binary Exponentiation allows for the computation of very high powers of numbers in O(log(n)) time complexity where n is the index of exponentiation.
Added :

  1. Implementations of binary exponentiation for Int, Long and BigInteger
  2. Tests for all three implementations

The recursion is done shallowly, therefore, if the index of exponentiation is larger than 2 ^ 1000, this can cause a stack-overflow.
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