[Utils] UberStream - with index

[vsubhuman]

UberStream should provide methods:

1. peekWithIndex(BiConsumer<T,Integer>):UberStream<T>
2. forEachWithIndex(BiConsumer<T,Integer>):void

Specified BiConsumer should receive stream element as first argument, and int value starting from 0 and incremented for each next element of the stream as second argument.

forEachWithIndex is similar to zipping stream with AtomicInteger and performing forEach, but note that peekWithIndex does NOT change type of the current stream.