Add a Resource Aware Pool

[kab163]

The resource aware pool will ensure that a data race will not occur when a stream (resource) attempts to reuse memory that is still be touched by a different stream (resource).

Still needed to be done:

• Implement an official RAP test
• Clean up example and add comments
• Add documentation and cookbook recipe
• Double check all the TODO comments (questions about whether or not a check is needed....)