Add a `this_thread::sleep_for` call into event loops to prevent CPU pinning

[mathemaphysics]

While the IConnecitonHandler and children have sleep statements within them to prevent CPU pinning, the IWorker objects used to do the actual work for IAMQPWorker instances do not. These result in CPU pinning, causing the CPU usage to read very high when nothing is actually being done. Even worse it eats up energy.

Insert a std::this_thread::sleep_for(std::chrono::milliseconds(10)) into the root IWorker and FWorker classes to make them realistic to use for anything.