Add O(1) Queue class

[aleclarson]

Useful for cases like Sindre described in his readme:

You should use this package instead of an array if you do a lot of Array#push() and Array#shift() on large arrays, since Array#shift() has linear time complexity O(n) while Queue#dequeue() has constant time complexity O(1). That makes a huge difference for large arrays.

A queue is an ordered list of elements where an element is inserted at the end of the queue and is removed from the front of the queue. A queue works based on the first-in, first-out (FIFO) principle.

Reference implementation: https://github.com/sindresorhus/yocto-queue