Single core benchmarks

[lyrm]

This library lacks some single core benchmarks to compare its domain safe data structures to the standard library data structures (that are not thread safe). This idea is to measure the overhead paid for lock-freedom and multi-domain safety.

Lockfree data structures	Standard library data structures
Michael-Scott queue	Stdlib.Queue
Mpmc queue	Stdlib.Queue
Spsc queue	Stdlib.Queue
Working stealing dequeue	Core.Deque
Treiber stack	Stdlib.Stack