[glow/runtime] First cut DeviceManager with CPU backend #2134
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Description: A first prototype of the DeviceManager, which is the interface to a single inference Device. Per our design discussion the interface supports three operations:
** addNetwork() - compile and load a module (or sub module) onto the device ready to be executed.
** evictNetwork() - unload a module from the device and from memory.
** runFunction() - run a Function (subgraph) with the provided context and callback with results.
The DeviceManager operates in it's own thread, which for the CPU backend implemented here also does compilation and running of the function.
Testing: Ported one unit test model to the new execution scheme as an example POC. A better test would be parallelizing the execution, however.
Documentation:
Part of the high level Runtime issue #2045.