Added EventStore sample
Experiment with moving workers inside GroupingBounded Queue
Revert "Experiment with moving workers inside GroupingBounded Queue"

This reverts commit 61720fcae367b9f4f1ebd3bf0436417c1d5880a5.

Seems better to add a wrapper to do this
Added a queue that tracks completion

Completion of single items and all items currently in the queue
are supported
Test WorktrackingQueue with EventStore