zip extension method for Iterator and Iterable

[Boereck]

Implement a zip extension method for Iterable and Iterator. This method will produce a list of pairs from both sources by their index. This is known from other languages and frameworks, such as Haskell, Scala, Kotlin, or Eclipse Collections.

• static def <T,V> Iterable<Pair<T,V>> zip(Iterable<? extends T>, Iterable<? extends V>)
• static def <T,V,Y> Iterable<Y> zip(Iterable<? extends T>, Iterable<? extends V>, (T,V)=>Y merger)
• static def <T,V> Iterator<Pair<T,V>> zip(Iterator<? extends T>, Iterator<? extends V>)
• static def <T,V,Y> Iterator<Y> zip(Iterator<? extends T>, Iterator<? extends V>, (T,V)=>Y merger)

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