Introducing Pluto

[wdeconinck]

Pluto is a memory resource manager based on C++ polymorphic memory resources.
It provides concrete implementations to allocate and deallocate memory on host and device using various strategies, including pinned host memory, managed memory, memory pools etc.
It also provides abstractions for device streams and memory transfer between host and device.

In this pull request, a first version of pluto is merely introduced as a subproject that at some point in the future could be in a repository of its own if so needed.

With this pull request It is not yet actively used in Atlas.
A follow-up PR will introduce pluto where possible to allocate/deallocate device memory instead of HIC, and cater for the memory transfer between host and device.
A next follow-up PR will allow atlas to use more of pluto and configure pluto for various GPU offload strategies.

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